Special cable is a series of products with unique performance and special structure. It is equivalent to a large amount of ordinary wire and cable. It has the characteristics of high technical content, strict use conditions, small batch size and high added value. New materials, new structures, new processes and new design calculations are often used.
1. High temperature resistant wire and cable
It is understood that high-temperature wire and cable is required in the fields of aerospace, rolling stock, energy, steel, non-ferrous metal smelting, oil extraction, and electric motors. Long-term continuous working temperature of 125 °, 135 °, 150 °, 180 °, 200 °, 250 ° and 250 ° high temperature wire and cable, currently commonly used radiation cross-linked polyolefin, silicone rubber, fluororesin, polyacyl Wire and cable such as imine, mica and magnesium oxide. Now introduced; two new high temperature wire and cable.
Polyethersulfone (PES) insulated wire
It has excellent heat resistance, physical and mechanical properties, electrical insulation properties, and extrusion molding properties. In particular, it has the outstanding advantages of being able to maintain stable performance in an environment where continuous use at high temperatures and rapid temperature changes: heat distortion temperature is 200. -220 degrees, continuous use temperature is 180-200 degrees, UL temperature index is 180 degrees; can withstand 150-160 degrees hot water or steam, is not attacked by acid or alkali at high temperature; elastic modulus is -100-- 200 degrees is almost constant, especially above 100 degrees, better than any thermoplastic resin; the coefficient of linear expansion is small, and its temperature dependence is small; it is non-toxic, recognized by the US FDA, and also conforms to No. 434 of the Ministry of Health and Welfare of Japan. The requirements of Announcement No. 178; self-extinguishing, without adding any flame retardant, have excellent flame retardancy, up to UL94V-0 (0.46mm).
2. Polyetheretherketone (PEEK) insulated wire
Polyetheretherketone is a super heat resistant thermoplastic resin. The long-term continuous use temperature is 250 degrees and the UL temperature index is 250 degrees.
PEEK is a flexible resin with good creep resistance. It is self-extinguishing and can be UL94V-1 (thickness 0.3mm), 94V-0 (thickness 1.5mm), 94V-5 (thickness 3.2mm) without any flame retardant.
2. Special wire and cable for use and structure
1. Low inductance cable
There are strong and weak electricity points. Here is a low-inductance cable for strong electricity. The cable is equipped with a heat dissipating device, which is used for connecting various types of contact welding machines, electric arc welding machines and pneumatic welding tongs. The structure is simple and reasonable, the cooling water circulation is large, and no blockage is formed. Blocking and current limiting, good heat dissipation and long service life.
The new low-sensitivity cable also includes connectors that are fixed on the cable and cable ends, and the cable is also composed of a positive core and a negative core in the outer hose. Since such low-inductance cables are generally used for voltages of 25-50V and currents between 7000-12000A, the short-circuit conduction phenomenon of cooling water in the cable is basically negligible, so there is no such low-impact cable. The rubber hose that isolates the positive and negative cores is specially provided with a core frame with a cross-section in the shape of a spoke (commonly known as "plum core"), surrounded by the "round center" and the adjacent "spokes". The space formed in the direction of the axis forms a longitudinal groove, and the longitudinal groove on the core frame is the same as the total number of the positive cores disposed on the cable, and the cable portion is placed on the positive and negative cores respectively. The longitudinal groove means of the core frame are formed in the outer hose. The heads of the positive and negative cores are respectively assembled into a bundle and clamped in the core clamp, and then fixed on the joint, and the end of the outer hose of the cable is set at the end of the joint, and used The set is tightly sealed outside the outer hose.
2. Low noise cable
Under the external factors such as bending, vibration, shock, temperature change, etc., the cable with a pulse signal less than 5mV generated by the cable itself is called a low-noise cable, also called a shock-proof instrument cable. It is used for the measurement of small signals in many fields such as industry, medicine, and defense. There are various types of cables, such as polyethylene insulated low noise cable, F46 insulated low noise cable, radiation resistant low noise cable, low capacitance low noise cable, hydrophone cable, watertight low noise cable.
The causes of noise in the cable are: 1) internal molecular friction of the medium itself; 2) change in cable capacitance; 3) piezoelectric effect of the cable medium; 4) friction between the conductor and the medium in the cable to generate charge, ie between the conductor and the insulation Separation of charge occurs when contact is broken.
A low-noise cable with a thin semi-conducting (thickness of 0.20-0.30mm) on the polyethylene insulation surface has been rapidly developed with a noise value of 2-3mV. For low-noise cables operating at 400 degrees, it can be used. The high temperature resistant semi-conductive fiber is wrapped around the package, and the noise can reach 5mV.
3. Functionalized wire and cable
1. Fluorine resin self-control stable 135 degree heating cable
A 135 degree self-regulating cable consisting of a polyvinylidene fluoride (PVDF) / fluororubber alloy / carbon black multi-composite. The thermodynamic range is different, showing different degrees of PTC conductivity and electrical conductivity stability, because the degree of crystallinity of the matrix and the crystal morphology are affected by different cooling rates.
2. Electroluminescent wire
Electroluminescent wire is the latest product in the field of international light-emitting display. Its shape is similar to that of ordinary wire and cable. The surface layer is colored fluorescent plastic sleeve. It works continuously without any heat radiation, and the power consumption is only 50-60% of LED light. 20-30% for string lights, 1-5% for neon lights; such products are widely used, creating a new era of energy-saving, environmental protection and healthy display lighting, with the following characteristics:
1) The light is soft and delicate, the color is bright, and the stereo and perspective are strong, which is suitable for night vision inspection.
2) Energy saving, environmental protection and safety; this product has low power consumption and wide application voltage range. This product will not cause any environmental pollution when used or discarded, and will not pose a danger to the human body.
3) Soft, foldable and bendable, freely knotted, cut and spliced ​​without affecting the luminescence performance, convenient and quick to use, no professional guidance is required for installation.
4) It is a continuous light-emitting device, and at the same time, according to the telephone control and matching actual dynamic multi-color flicker.
5) It can be directly fixed to the surface of the decorative object by using transparent tape, glue, pins, wire nails, etc.
The application fields of such wires are:
1) Indoor advertising, text graphics; window, door, furniture, walls, roof, etc.
2) Decoration of tools such as cars and boats; instrument indication and digital display.
3) Safety signs and instructions; stairs, passages, house numbers, exits, temporary outdoor hazardous sites.
4) Toys, arts and crafts, sporting goods, clothing, electrical appliances, decoration, military equipment, etc.
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Tags: four major categories of special cables
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