High temperature insulating tape and wire or cable sheathed therewith
SUBSTANCE: invention relates to high performance, high temperature resistant wires and cables as well as to a method for production thereof. Said wires and cables are fire-resistant and are used in heavy operating conditions, such as drilling or mining operations, industrial, military, aerospace and sea applications. Tape (20) comprises a laminated or co-extruded insulating first layer (24) of a polymer matrix in which mica particles are dispersed and second layer (26) of a polyether ether ketone (PEEK) or a blend or alloy thereof containing at least 50 wt% of PEEK. Surface of at least one said layer, opposite other said layer, is coated with fluoropolymer film (25). Sid tape can be used to form a multilayer coating on conductor (10) such as an electric wire. Outer protective layer (28) of a fluoropolymer such as PTFE may be applied around wrapped tape, by wrapping or extrusion.
EFFECT: technical result is production of wires and cables with good insulation, high temperature resistance, and also having improved mechanical properties at high temperatures.
59 cl, 4 dwg, 1 tbl
SUBSTANCE: method of electric conductor manufacturing includes introduction of an additive consisting of a mix of heat-resistant organosilicone fluid (OSF) and heat-resistant fluororganic compound (FOC) in the amount of 0.3-1.5% by weight into granulate of radiation-synthesized compound based on copolymer of tetrafluoroethylene and ethylene. Proportion of OSF and FOC varies within limits of 1:3 up to 3:1. The obtained mixture of granulate and additive is delivered to a loading hopper of the extrusion machine, thereafter at least one coating of this mixture is applied as insulation to electric conductor and irradiated. Electric strength of conductor is more than 70 kV/mm.
EFFECT: improving manufacturability and productivity of the suggested method due to exclusion of destruction of radiation-synthesized compound at growth rate of its application to conductor, high physical and mechanical and electrical properties of insulation.
3 tbl, 1 ex
SUBSTANCE: marking label made of a flexible elastic material in the form of a strip having a lengthy shape and arranged along a market item, besides, it is equipped with two pairs of transverse slots arranged at the label edges and having length slightly higher than the length of marked item circumference section.
EFFECT: reduced material intensity, higher manufacturability of production and improved operational properties of a marking label, simplified design and higher universality, reliable fixation of a label without a risk of its slippage on a marked item.
2 cl, 4 dwg
SUBSTANCE: object of the present invention is an electric cable (1), containing shell (2) with external marking. Marking is formed by block (3), at the same time pictures (4, 5) are arranged serially along cable length, besides, block of pictures is repeated at least twice along the cable length, starting from the free end of cable (12). The object of the present invention is also the method to press contact (7) on such a cable, at the same time external marking makes it possible to determine position of cable in cartridge.
EFFECT: good quality of further pressing.
18 cl, 10 dwg
FIELD: electrical engineering.
SUBSTANCE: proposed current-carrying cable has insulated current-carrying conductors covered with insulating sheath and connected at ends to contact assemblies. Insulating sheath is essentially band with current-carrying conductors connected at its edges to provide for regulating conductor-to-conductor capacitance and spaced minimum 4 cm apart on band section between contact assemblies; mentioned band is made for interconnecting its edges at least on part of its length for driving current-carrying conductors together. Current-carrying conductor used for proposed cable has two insulated wires covered with common insulating sheath. Both wires are stranded over conductor length; stranded wires are essentially equal-length conductors alternately stranded clockwise and counter-clockwise and having equal number of turns and twisted with equal force.
EFFECT: ability of regulating conductor-to-conductor capacitance over perimeter.
4 cl, 12 dwg
FIELD: electrical engineering.
SUBSTANCE: proposed device has hose 22 designed for fixation on cable 3 and provided with relevant cable identifying marks on its outer surface. Hose is flattened and its section 23 is closed on at least part of its width while its naked part forms passage for cable 3.
EFFECT: facilitated use of device.
12 cl, 13 dwg
SUBSTANCE: invention relates to a heat-resistant wire or cable with improved operational properties designed for use in demanding or extreme conditions, for example in well drilling or field development, in industrial, military aerospace, naval fields, as well as in the motorcar, railway and public transport. Such cables can be subjected to extreme temperatures, corrosive substances or atmospheres or fire. The wire or cable comprises a conductor and a polymer sheath consisting of an internal and an external layer. One layer is tape made of polyetheretherketone (PEEK) and has thickness of 5-150 mcm. The second layer is fire-resistant and is made of a siloxane polymer or a polymer based on silicon dioxide as a polymer matrix. The PEEK tape can be combined with a mica layer or a layer which is polymer tape with mica particles.
EFFECT: invention increases fire-resistance of the sheath, its flexibility and resistance to mechanical stress, enables to obtain a wire or cable with a lower weight and diameter.
12 cl, 5 dwg
FIELD: physics; electricity.
SUBSTANCE: fibre glass layer contains out-of-wind fibre glass. It can be woven fibre glass fabric. The material is applied mainly for covering electric conductor, such as wire applicable for high-temperature environments and coils for high-voltage electric motors and generators.
EFFECT: possibility of production of thinner insulation material without deterioration of mechanical or electric properties.
19 cl, 3 tbl, 3 ex
FIELD: insulation materials.
SUBSTANCE: invention relates to electroinsulation materials for electric machine windings and aims at creating electroinsulation material possessing high heat resistance (155-180°C), high electrical and mechanical strengths, environmental safety, and which would retain its flexibility over a long storage period. Electroinsulation material according to invention contains mica paper layer, one or two substrate made of glass fabric or from glass fabric and polyester or polyimide film, and binder based on unsaturated nitrogen-containing polyester prepared by condensation of maleic anhydride and polyatomic acids with N-(β-hydroxyethyl)-1,2-amidophthalic acid, N-(β-hydroxyethyl)-1,2-amidoisomethyltetrahydrophtalic acid, N-(β-hydroxyethyl)-1,2-amidoendomethylene trahydrophtalic acid, or mixture thereof (39.6-40.9 wt parts), polymerizable diluent: oligoether acrylate (36.0-48.7 wt parts), and peroxide initiator (0.8-1.0 wt parts), oligoether acrylate including also target additives (2.4-14.0 wt parts), and optionally low-molecular weight epoxy acid as second binder (2.0-12.1 wt parts).
EFFECT: improved performance characteristics.
2 tbl, 13 ex
FIELD: electrical engineering; insulating materials for wires or commutators of electrical machines.
SUBSTANCE: proposed mica base insulating material has mica paper layer, backing of inorganic fiber (glass or basalt), and binders, such as betulinic and adipic acids having molecular mass of 10 000 to 15 000. Such binders of desired molecular mass can be easily produced.
EFFECT: enhanced mechanical strength, heat resistance, and flexibility; facilitated manufacture.
1 cl, 2 tbl, 11 ex
FIELD: process engineering.
SUBSTANCE: invention relates to multilayer structures used primarily in food packages, various vessels, etc. This structure comprises at least 8 polymer layers and one polymer ply. The latter comprises layer A of polymer composition containing polymer with gas-barrier properties which features oxygen penetration rate measured as described in Japan Industrial Standard JTS-K7126 (isopiestic method) at 20°C relative humidity of 65% at the level of not over 100 mlˇ20 mcm/(m2ˇdayˇatm). It layer B consists of polymer composition containing thermosetting polymer, at least one of polymer compositions included in layer A and layer B adjacent compositions containing metal salt. Note here that content of metal salt makes at least 1 ppm and not over 10000 ppm in equivalent units of metal salt. Note also that adhesion between said layers A and B makes at least 450 g/15 mm. Later A and layer B can be interlaced with one another. Moreover, mean depth of single layer selected from layers A and B makes, preferably, 0.01 mcm and not over 10 mcm.
EFFECT: fine gas-barrier properties preserved at stretching or bending.
21 cl, 11 tbl