RU2001128151A - Multilayer bag for temperature control of products of complex geometric shapes - Google Patents

Claims (4)

1. A multilayer package for temperature control of products of complex geometric shape, containing the outer and inner protective layers with interconnected heat-insulating spacers and strips of conductive material between them with insulating layers connected at the ends by conductive jumpers, characterized in that the conductive material strips are made in the form of a woven filler plain weaving, consisting of four systems of threads, three of which are longitudinal in the form of strips of electrical insulation of filaments, current-distributing and current-carrying metallized tinsel filaments and the fourth, intersecting with them and perpendicular to them, located from complex electrically conductive heat-generating polymer filaments made of polycaproamide fibers, on the outer surface of which a conductive composition based on ethylene fluoride copolymer-etherafide copolymer is applied filled with furnace soot in a mass ratio of 1: 0.6 to 1: 0.8 with a total linear density of 52–58 tex thread, p In this case, the number n of complex electrically conductive heat-generating polymer fibers per unit length of the woven filler, the number K * of current-carrying strips of metallized tinsel yarns per unit width of the woven filler, and the number m ₁ and m _{2 of} metallized yarns for an even and odd number of current-carrying strips should correspond to the ratio:

where P is the rated power of the heating element, W; γ _e - the maximum allowable heat release per unit length of the conductive thread, W / m; A and B, respectively, the length and width of the resistive layer, m; U-set supply voltage, V; R _n - linear electrical resistance of the conductive filament, Ohm / m; γ _m - ultimate heat release per unit length of the metallized yarn, W / m; R _m is the electrical resistivity of the metallized yarn, Ohm / m. 2. The multilayer bag according to claim 1, characterized in that the conductive jumper is made of pressed electrically insulating composite material foil on both sides with copper or brass foil, while the current-carrying strips of metallized tinsel threads on one side of the woven filler are alternately switched on each side of the conductive jumpers and fastened with foil by means of a brass or copper tape, and on the other side of the woven filler - alternately ringed between each other by u-shaped ychkami of metallic tinsel strands or strips of copper foil. 3. A multilayer bag according to claims 1 and 2, characterized in that it repeats the geometry of the thermostatically controlled product and is made up of separate sections, the outer protective layers of which are made of dust and moisture-tight fabric like “Oxford PU” in the peripheral zones, equipped with a loop or hook of a textile fastener like “Contact” "are fastened to each other along the interface lines at the joints of the insulating gaskets and are additionally fixed with mechanical locks of the Apri lock-buckle type, with the upper part of the multilayer package consisting of a conical part and olpaka, fixed to the head portion of the article, and a lower part, consisting of separate cylindrical sections fitted upon completing the perimeter apron with through holes, bonded to the support ring. 4. The multilayer package according to claim 3, characterized in that the support ring is made of several elements fastened together, for example, segments consisting of outer and inner vertical and central horizontal surfaces made in one piece, and the inner surface repeats the geometry of the final part the design of the thermostatic product and is equipped with grooves matching the threaded holes on the body of the product, the outer vertical surface repeats the perimeter of the final cylindrical part of many layered package and is equipped with threaded holes for mounting individual sections, and the horizontal surface contains mounting holes for joining the monitoring system and control thermostatic control of individual sections of the multilayer package, connected in parallel to a single source of electricity.