FIRE RETARDANT CABLE - CHASE CORP,US > 자유게시판

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The utilization of the laminate adhesive additionally improves the fireplace-resistance traits of the cable. The adhesive is coated onto the polyester film below comparatively low utility stress and then the film and scrim are introduced together while in a drying oven, the scrim being under comparatively excessive lengthwise tension and the coated movie being below a lesser tension, with the result that the scrim and film adhere tenaciously to each other. Turning now to FIG. 2, tape 14 is comprised of a 20 × 10 open weave glass fiber cloth or scrim 22. A continuous film 24 made of polyester, corresponding to that bought under the tradename "Mylar," is bonded to the scrim utilizing a comparatively low viscosity fire-retardant plastic laminate adhesive 26. Suitable adhesive supplies embody acrylic, acrylic-polyvinyl chloride copolymers and polyurethane. Consequently, when the tape 14 is wrapped on the conductor as proven in FIG. 1, it constitutes a substantially continuous membrane all around the tape from one end of the tape to the opposite.

Consequently, even after it has been in roll type for a comparatively very long time, the tape may be pulled from the roll without "pickoff" of the film from the scrim. Rather, the scrim 22 and coated film 24 are maintained underneath completely different lengthwise tensions which causes the two to be urged together within the drying oven with the consequence that they develop into firmly bonded to each other. Therefore, the two layers are urged together without the glass fibers within the scrim being cracked by extreme strain. In use, the tape is wound in regards to the clustered electrical conductors with typical filler materials being supplied if need be to fill the areas between the conductors in order that the cable assures a generally round cross part. Finally, after the jacket 18 is utilized, the conductors are shielded be double steady membranes. Finally, an outer resinous jacket is extruded in situ over the taped conductors, thereby forming a second continuous barrier or film across the conductors. An outer jacket 18 of a waterproof resinous material comparable to polyvinyl chloride, neoprene, or the like, is extruded in situ over the wrapped conductors, thus finishing the cable 10. As might be seen presently, the tape 14 and jacket 18 collectively kind a double steady insulating barrier which is substantially impervious to moisture and the elements.

Accordingly, this invention aims to provide a tape for insulating a cable similar to a service entrance cable which is relatively easy to make in uniform high quality tons. These factors additional adversely affect the general insulating characteristics of the cable. That prior type of cable is disadvantaged too because the unvulcanized barrier layer isn't utterly steady; it comprises pinholes which provide passages for air or moisture which adversely have an effect on the dielectric energy of the cable insulation. These cracks tend to lower the tensile energy of the fibers. Desirably, additionally, a filler sixteen composed of asbestos fibers or different such materials is wrapped along with conductors 12 in order that it fills the spaces between the conductors, thereby giving the cable a cross section which is basically spherical. Also, by virtue of the low viscosity adhesive working up between the glass fibers 22a in the scrim, the tensile strength of the tape is definitely enhanced because the adhesive appears to kind a buffer between the person fibers 22a, reducing their tendency to abrade one another. Also, the unvulcanized rubber-coated glass cloth is utilized to the conductors in the type of tape which is unwound from a roll.

In actual observe, the barrier layer tends to "choose off" from the cloth because the tape is unwound from the roll and it also undergoes a certain quantity of chilly movement. During this bonding process, the coated movie and scrim are usually not pressed together with any great amount of pressure. When the tape is constructed in this style, the polyester movie 24 therein is considerably continuous and devoid of pinholes and presents a continuous, clean floor in order that the tape 14 will be served from a roll with out the movie adhering to itself and selecting off from the scrim. Moreover, the tape floor is comparatively clean. The web result is a superior insulating, bedding and binding tape which can be made at a lower value than prior comparable products and which, when integrated into an exterior cable system, allows the latter to simply go all the UL tests for such cables. Fire Sealing and Fire barrier for Electrical Cables and Cable Openings / Cut-Outs. The current cable has several distinct advantages over its conventional counterparts as exemplified by the cables described within the aforesaid patents. All of those components make the current tape a highly successful industrial product whose attributes are additionally enjoyed by the cable system into which the tape is incorporated.