101results about How to "Shield electromagnetic radiation" patented technology

A voice coil motor comprises a stator which is a reverse L-shaped magnetic yoke and also can be taken as a shell. The voice coil motor is characterized in that one end is provided with an opening, and the other end is not completely closed and provided with a hole; magnetite is placed on the inner wall of the shell; a base plate is matched with the shell, and a lower magnetic yoke plate is arranged on the base plate; a rotor drives a coil to be wound on a lens supporting body of an outer cylindrical surface; the connecting way is that the rotor is hung inside a stator by an upper plate type shrapnel and a lower plate type shrapnel; a frame of the upper shrapnel is fixed by an upper support chip and the magnetite, and the circular arc at the inner side is bonded with the upper end part of the lens supporting body; a frame of the lower shrapnel is fixed by a lower support chip, and the circular arc at the inner side is bonded with the lower end part of the lens supporting body. By utilizing a closed magnetic circuit formed by the reverse L-shaped shell and the magnetic yoke plate, the voice coil motor improves the stability of the magnetic circuit; the closed metal space region can be used for preventing electromagnetic radiation; the shell serves as an assembled framework, and the coil is directly wound on the cylindrical surface of the lens supporting body, so that the number of air gaps among movable bodies in the magnetic circuit is reduced. Therefore, the voice coil motor has the advantages of compact structure, low processing difficulty of the parts, simple assembly technology and strong practicability.

The invention provides a protective device of a power battery, which solves the problem that the whole battery pack forms a short-board effect because the environmental temperature difference between single batteries causes the effectiveness reduction of single batteries in the process of charging and discharging a battery pack of the power battery in the prior art. The protective device comprises a closed battery box inside which a liquid is contained, wherein the battery pack is immersed into the liquid inside the battery box. The invention also provides a protective method of the power battery, comprising the step of immersing the battery pack of the power battery into the liquid. The protective device or the protective method can equalize the environmental temperature of all single batteries in the battery pack, avoid the problem of the single batteries, prevent the short-board effect, prolong the service life of the batteries and also achieve the effect of fire prevention because of the liquid sealability of the liquid.

The invention relates to a compound-type fabric containing liquid metal. The fabric can be completely woven by blended fiber yarn of a liquid-metal-containing fiber, and can also be woven by mixing a natural fiber yarn and blended fiber yarn of the liquid-metal-containing fiber, wherein the liquid-metal-containing fiber is a textile fiber the surface of which is adhered with liquid metal nanoparticles, a tubular textile fiber the pipe of which is filled with liquid metal, or a reticular casing-pipe-type textile fiber which is woven by nanowires and the reticular casing pipe of which is filledwith liquid metal; and the liquid metal is gallium metal, gallium-based alloy, Na-K alloy or wood metal containing indium. The compound-type fabric can be made into a single layer, two layers or three layers according to requirements, can be used as a basic fabric for manufacturing articles such as clothes, trousers, shoes and hats, gloves, stockings, bedclothes and pillowcases and the like, can endow clothing and household articles with temperature adjusting, radiation proofing, electrostatic resisting and sterilizing and antimicrobial functions, has stable performance and high reliability, needs not to be added with other organic components, and can be used for making up the defect of the property singleness of the traditional fabric.

The invention discloses a preparation method for a fibreboard. The preparation method comprises the following steps of: uniformly mixing fibres with carbon particles accounting for 3-5% of the total mass, and then preparing the fibreboard via needling, heat setting and rolling. According to the preparation method disclosed by the invention, during a preparation process, an adhesive is not needed; the fibreboard is environment-friendly, and furthermore, the carbon particles in the fibreboard can also be used for effectively absorbing hazardous substances volatilized and released in a room. Via the needling procedure of the preparation method disclosed by the invention, the opportunity that the carbon particles are in contact with the outside is increased; during hot-pressing, low-melting-point polyester staple fibres are melted, and capable of being integrally bonded with conventional polyester staple fibres, polyamide fibres or carbon fibres and the carbon particles, thus ensuring no falling-off of the carbon particles during a use process; the carbon particles can be in contact with more air via pores among the fibres or gaps between the carbon particles and the fibres, thus increasing the adsorption efficiency of the fibres; and an adsorption experiment for formaldehyde proves that the adsorption efficiency of the fibres achieves more than 85%.

The invention relates to a material which can absorb electromagnetic waves more effectively within the range of 1G to 100G. The material has a general formula of R2Fe14B, wherein R is a composition of rare earth elements of Sm and Nd according to the proportion of Nd<1-x>Sm<x>, wherein x is not less than 0.3 and not more than 1. The easily magnetized direction of the electromagnetic wave absorption material is not parallel to the C-axis. The invention also relates to a method for preparing the electromagnetic composite material with better performance. The preparation method of the composite material comprises the following steps of: putting the material in an uncured bonding material, fully and evenly mixing, then putting the mixture into a die made of a nonmagnetic material, and putting the die in the magnetic field for oriented treatment.

The invention discloses shielding cloth and a production method thereof. The shielding cloth comprises warp yarns and weft yarns and is characterized in that the warp yarns and the weft yarns are formed by doubling three kinds of grey yarns, namely stainless steel fiber mixed spinning cotton yarns, cotton bale stainless steel micro silk yarns and cotton yarn coated silver-plated terylene long silk yarns. Therefore, the shielding cloth cannot be exposed and oxidized, and the yarns cannot be broken and fall off under the action of external force; and a shielding thick net is formed by fully utilizing the advantages of the stainless steel fiber mixed spinning cotton yarns, the cotton bale stainless steel micro silk yarns and the cotton yarn coated silver-plated terylene long silk yarns, thusthe shielding effect of the shielding cloth is stronger.

The invention discloses a multifunctional composite material and an application thereof. The multifunctional composite material is in a layer-like structure formed by using a binding agent to carry out hot-press compositing, and comprises an upper outer surface layer, a lower outer surface layer and a middle layer. The multifunctional composite material is characterized in that the upper outer surface layer and the lower outer surface layer are formed by transparent polymers; the middle layer contains at least one layer of textile fabric; art patterns are arranged on at least one surface of the textile fabric; and the binding agent for hot pressing is a non-light-tight polymer. The composite material disclosed by the invention has various functions of high light transmission, art decoration, light weight and convenience, high strength, strong anti-impact capability, screening of electromagnetic radiation, high toughness, isolation of ultraviolet rays and infrared rays and the like, and can be applied to various industries, such as industries of manufacturing a sun-shading and lighting product, a panel for a household appliance, an indoor decorative material, a sports protection product, a safe protection product, a partition wall, abruption, a luggage and the like. The multifunctional composite material is widely applied, can meet various functional requirements on the material in the current society, and has the advantages of practical values, energy conversation and environmental friendliness.

The photoelectric converter comprises: a shell with top / bottom cover, a signal processing module in shell, a photoelectric conversion assembly, and an elastic interface unit between two covers to process signal and fix the grounding loop. This invention can shield EMI efficiently, and increases device reliability.

The invention provides a material which can absorb electromagnetic waves and is formed by transition intermetallic compounds. The general formula of the material is R2(Co1-xFex)17, wherein R in the general formula is Nd or Ce; when R is Nd, x is not more than 1 and not less than 0, when R is Ce, x is not more than 0.8 and not less than 0.6; and the direction of easy magnetization of the material is vertical to the C axis. The special description is as follows: if the components meet the above general formula but the direction of easy magnetization of the material is parallel to the C axis, the material is not suitable for serving as the material absorbing electromagnetic waves. A method for preparing a composite material by utilizing the material of the invention is characterized by placing the material of the invention into non-cured binding materials, after fully mixing the material and the non-cured binding materials uniformly, placing the mixture into a die manufactured by nonmagnetic materials, placing the die in the magnetic field and ensuring the die to rotate in the magnetic field, and carrying out orientation.

The invention provides a heat dissipation system of heating modules, wherein the plurality of heating modules are respectively fixed on the two sides of a circuit board; and two heat dissipation modules are respectively covered on the surfaces of the heating modules at the two sides of the circuit board and lead the plurality of heating modules and the circuit board to be clamped and fixed betweenthe two heat dissipation modules, so that a sandwich structure is formed. The heat dissipation system has compact structure, large heat dissipation area and good heat dissipation effect, and can effectively shield electromagnetic radiation.

The invention discloses a loudspeaker. The loudspeaker comprises a vibrating diaphragm, a basin stand, a sound coil, a metal pillar, a first input end, a second input end, a magnet, a magnetic carrier and a metal shell, wherein the basin stand is used for supporting the vibrating diaphragm, the metal pillar is arranged in the sound coil, the first input end and the second input end are connected with the sound coil, the magnetic carrier is used for bearing the magnet, and the metal shell is connected with the basin stand and used for containing the sound coil, the metal pillar, the magnet, the first input end, the second input end and the magnetic carrier. By the adoption of the loudspeaker, electromagnetic radiation can be shielded, so that the electromagnetic radiation of the sound coil is lowered, the sound quality is effectively improved, digital sounds in the audio field are effectively removed, the sound timbre is made soft, analysis force is increased, and the sound effect is improved.

The invention discloses combined wadding, which comprises a plurality of layers of fiber webs. The fiber webs are formed by intersecting and blending cotton fibers and functional fibers. Thus, the combined wadding of the invention can well combine the cotton fibers and the functional fibers, greatly spreads the advantages of the cotton fibers and the functional fibers, and is uniform in web laying and good in shaping.

The invention provides a high-power wireless charging test mechanism comprising a transmitting coil system, a receiving coil system disposed on an automobile, an independent rotating platform for driving the transmitting coil system to rotate, and a universal table for driving the transmitting coil system to turn over. Therefore, various states of two coils during the actual wireless charging process can be simulated; the automation degree of the testing is increased; and the testing efficiency is improved. And a solution is provided for high-power wireless charging of the electric vehicle.

The invention discloses a radiating shield case, which comprises a radiating layer and a shielding layer, wherein the radiating layer is arranged above the shielding layer; through holes are arranged between the radiating layer and the shielding layer; the radiating layer is provided with a protective edge protruding outwards; the radiating shield case is an integrally formed aluminum body; the periphery of the radiating layer is convex upwards, so the whole radiating layer is in a groove shape; the shielding layer is provided with a shielding section which is provided with a radio frequency section, a data processing section and a power source section; an integrally formed aluminum wall is arranged between the radio frequency section, the data processing section and the power source section; the radiating layer of the radiating shield case dissipate heat generated by operation of a cell, so that the cell works at a proper temperature for a long time, and the service life of the cell and electronic components is prolonged; and the shielding layer can shield electromagnetic radiation outside circuits or the electronic components.

The invention discloses a single-electrode-controllable plasma oven. The single-electrode-controllable plasma oven comprises a base, one or more cooking ranges arranged on the base, and an electric control unit; each cooking range comprises a cookware support exposed above the base, and a plurality of discharge electrodes located on the inner side of the cookware support; each cooking range further comprises a high-voltage pack arranged in the base, wherein the high-voltage pack comprises a shielding shell and a plurality of miniature transformers arranged in the shielding shell in a sealed mode; and the input end of each miniature transformer is electrically connected with the electric control unit and separately controlled by the electric control unit, the output end of each miniature transformer is electrically connected with the corresponding discharge electrode, and each miniature transformer transforms low-voltage electricity input by the electric control unit into high-voltage electricity to be discharged through the discharge electrode electrically connected with the miniature transformer. Switching of each discharge electrode can be separately controlled, thus the heatingeffect of the plasma oven is accurately controlled, and meanwhile electromagnetic radiation generated by a high-frequency and high-voltage circuit in the plasma oven can be effectively shielded or restrained.

The invention relates to a weft-knitting knitted anti-radiation fabric, which is prepared from yarns and spandex through weft knitting in a weft knitting machine. The fabric is prepared by the following steps of: in a first path, simultaneously feeding natural fiber yarns and spandex yarns, looping with low needles in needle cylinder knitting needles, and floating with high needles in the needle cylinder knitting needles; in a second path, looping anti-radiation yarns with high needles in the needle cylinder knitting needles, and floating with the low needles in needle cylinder knitting needles; and repeating the knitting method of the first path and the second path in a third path and a fourth path, and taking two paths as a cycle, and circulating, wherein the natural fiber yarns are combed cotton / Modal blended yarns; and the anti-radiation yarns are polyamide yarns with silver plated surfaces. The fabric attenuates 40 to 50 decibels in a range from 10 to 3,000MHz, has the shielding efficiency of over 99.99 percent, and can effectively shield electromagnetic radiation from home appliances and natural world. Meanwhile, compared with a fabric singly prepared from an anti-radiation material, the invention has obvious advantages that: the fabric is light, thin, ventilating, soft and comfortable.

The invention relates to a macromolecular film. The macromolecular film comprises a base layer (1) and a PET (Polyethyleneglycol Terephthalate) protective layer (2) and is characterized in that an electromagnetic radiation preventing layer (3) is arranged between the base layer (1) and the PET protective layer (2) and is a silver-fiber layer, the base layer (1) is made from a fabric, the fabric comprises warps and wefts, the warps are artificial cotton yarns, the wefts are Hemp / Richcel fiber union yarns, and the warps and the wefts are arranged in a manner of being vertical to each other. According to the macromolecular film, the electromagnetic radiation preventing layer is arranged between the base layer and the PET protective layer and is the silver-fiber layer, an internal magnetic field is formed by the silver-fiber layer and an electrical appliance generating electromagnetic radiation, and then, the electromagnetic radiation is shielded, so that the effect of preventing the electromagnetic radiation is achieved. The macromolecular film has moisture-guiding and air-permeable properties.

A multifunctional anti-radiation maternity dress includes an inner layer and an outer layer coating the inner layer; the inner layer is a fabric which is blended by metal fibers and textile fibers; and the outer layer is a coating containing metal or oxide thereof, and the thickness of the outer layer is 0.05-0.5 mm. The Multifunctional anti-radiation maternity dress can prevent electromagnetic radiation generated by common household appliances, and can prevent x-ray and gamma-ray generated by sunlight, earth natural backgrounds and common household appliances.

The invention discloses a multifunctional anti-radiation coating and a preparation method thereof. The multifunctional anti-radiation coating consists of the following raw materials in parts by weight: 68.0-85.0 parts of a polyvinyl acetate emulsion, 2.0-3.0 parts of nano zinc oxide, 10.0-17.0 parts of titanium dioxide, 2.0-5.0 parts of copper powder, 18.0-30.0 parts of barium sulfate, 0.5-1.5 parts of CMC, 2.0-3.0 parts of manganese naphthenate, 0.5-1.5 parts of methyl ethyl ketoxime, 1.0-3.0 parts of dibutyl phthalate, 1.0-2.0 parts of polymethyl acrylate, 1.0-2.0 parts of benzotriazole, 6.0-8.0 parts of nano anion powder, 10.0-20.0 parts of deionized water, 1.0-3.0 parts of a suspending agent, 8.0-12.0 parts of a filler and 2.5-6.0 parts of a filming additive. The multifunctional anti-radiation coating disclosed by the invention is convenient to construct, rapid to cure, good in stability, environmental-friendly and non-toxic, is capable of not only effectively shielding radon gas, but also preventing electromagnetic radiation and ionization radiation, moreover is capable of effectively absorbing harmful gases such as formaldehyde, is capable of purifying air, and is a multifunctional anti-radiation coating.

The invention discloses a shielding metamaterial with the zero magnetic conductivity for wireless charging of electric cars. The shielding metamaterial comprises dielectric substrates, resonant capacitors and resonant structures which are attached to the medium substrates and periodically arranged, wherein the resonant structures are square open resonant rings and resonant coils connected throughmetal wires, and the resonant capacitors are welded to the back faces of the medium substrates and connected with the resonant structures. By designing and optimizing the unit geometry size, the metamaterial achieves the equivalent zero magnetic conductivity characteristic nearby the wireless power transmission work frequency. When electromagnetic waves are incident on the metamaterial with the zero magnetic conductivity, the electromagnetic waves can generate reflection, therefore, a good shielding effect is achieved on a magnetic field outside a transmission channel, and meanwhile the transmission efficiency of a wireless power transmission system is improved. The shielding metamaterial with the zero magnetic conductivity for wireless charging of the electric cars is suitable for solvingthe problem of the influences of electromagnetic radiation on human and environment in an existing concerned electric car wireless charging technology.

The invention relates to a unit combined type steam generating device. The unit combined type steam generating device comprises an impounding reservoir, a water collecting splitter, a steam generating component, a power distribution cabinet used for monitoring the electric power quality of electric equipment of the device and a control cabinet used for controlling the normal operation of the device; the impounding reservoir is connected with the water collecting splitter through a regulating valve; the water collecting splitter is connected with the steam generating component through magnetic valves, the steam generating component is connected with the power distribution cabinet, and the control cabinet is connected with the impounding reservoir, the water collecting splitter, the steam generating component and the power distribution cabinet through a data bus. The unit combined type steam generating device adopts the mode that connecting a plurality of existing low-power electromagnetic heating steam generators in parallel or in series to combine the steam generating component of a needed power, a centralized control conducted on the steam generating component is achieved, and meanwhile, the single-machine single-control mode is adopted, and the response speed of the device is high.

The invention provides a carbon-fiber double-conductor grounding heating cable. The carbon-fiber double-conductor grounding heating cable comprises a main wire and heating wires. The heating wires are connected with the main wire. The heating wires are connected in parallel. The main wire comprises a live wire body, a first null wire body and a first grounding wire body. Each heating wire comprises a second null wire body, a second grounding wire body and an electric heating wire body. The carbon-fiber double-conductor grounding heating cable has the advantages of being safe to use and good in electrical property.

The invention discloses a preparation method for a silver golden regenerated cellulose fiber / silver golden regenerated cellulose fiber fabric. According to the preparation method, regenerated cellulose fiber and / or regenerated cellulose fiber fabric is taken as a raw material and soluble silver salts are adopted to obtain the golden regenerated cellulose fiber / golden regenerated cellulose fiber fabric, under the action of lewis acid catalysts and by adopting a catalytic nano chemical plating technology. The silver golden regenerated cellulose fiber / silver golden regenerated cellulose fiber fabric has the functions of antibiosis, deodorization, static electricity resistance and anti-electromagnetic radiation, and can be applied to the fields of military, medical treatment, public health, home furnishing and clothing. The regenerated cellulose fiber, adopted as the raw material by the invention, is cotton pulp regenerated cellulose fiber, wood pulp regenerated cellulose fiber, bamboo pulp regenerated cellulose fiber, or sodium alginate regenerated cellulose fiber; the regenerated cellulose fiber fabric, adopted as the raw material by the invention, is pure fabrics or blended fabrics of the regenerated cellulose fibers, or the blended fabrics of the regenerated cellulose fibers and other chemical fibers.

The invention discloses an iron-nickel magnetic reinforcing ethylene propylene diene monomer sealing rubber strip which is prepared from the following raw materials in parts by weight: 100-105 parts of ethylene propylene diene monomer, 15-17 parts of OMMT, 20-22 parts of high density polyethylene, 7-9 parts of molybdenum disulfide, 2-3 parts of polytetrafluoroethylene powder, 3-4 parts of DOP, 0.2-0.22 part of dibenzoyl peroxide, 4-5 parts of maleic anhydride, 2.5-3 parts of sulfur powder, 12-14 parts of carbon black, 3-4 parts of tetramethyl thiuram disulfide, 9-10 parts of solid natrium hyelroxide, 0.8-1 part of silane coupling agent kh570, a proper amount of absolute ethyl alcohol, 7.1-7.5 parts of nickel chloride, 2.7-3 parts of ferric chloride and 75-80 parts of hydrazine hydrate with the concentration of 80 wt%. The iron-nickel magnetic reinforcing ethylene propylene diene monomer sealing rubber strip can be used as seals of a switch cabinet and an equipment cabinet of an electronic device, is not only excellent in sealability, but also can shield electromagnetic radiation, and decreases electromagnetic-wave interference.

The invention discloses a silver fiber interwoven radiation-proof shirt fabric, which comprises warps and wefts, wherein nano silver fibers, two-strand combed cotton color yarns and maifan stone color yarns are respectively selected and used as the warps; nano silver fibers and Tencel color yarns are respectively selected and used as the wefts; and the warps and the wefts adopt a one-up one-down plain weave. Compared with common shirt fabrics, the shirt fabric disclosed by the invention has obvious advantages, i.e. the shirt fabric can effectively prevent electromagnetic radiation, has the efficacies and characteristics of bacteria resistance, deodorization, moisture absorption, good air permeability, body temperature regulation, skin pH value regulation, good antistatic property, water washing resistance, high wearing comfortableness and the like, and is an environment-friendly hygienical functional fabric which is preferred by the clothing industry for producing radiation-proof shirts.

The invention provides an electromagnetic interference-prevention power regulation circuit integrated module and an installation method thereof. The electromagnetic interference-prevention power regulation circuit integrated module comprises a copper-coated ceramic substrate and power regulation circuit components and also comprises a shell, wherein the power regulation circuit components are arranged on the copper-coated ceramic substrate, the copper-coated ceramic substrate and the power regulation circuit components are arranged in the shell, the copper-coated ceramic substrate comprises aceramic layer at a bottom layer and a copper-coated layer at an upper layer, the shell comprises a shell body, an upper cover plate and lead terminals, the shell body wraps bottom surfaces and peripheries of the copper-coated ceramic substrate and the power regulation circuit components, the upper cover plate covers the top of the shell body, and the lead terminals are used for connecting the interior and the exterior of the shell body. The electromagnetic interference-prevention power regulation circuit integrated module has the beneficial effects that a power regulation circuit with relatively serious electromagnetic interference is completely sealed in the shell, the distribution parameter of a power device interconnection loop is reduced, and the electromagnetic radiation of the powerregulation circuit is effectively shielded; and with the adoption of a material with favorable heat conductivity, the thermal resistance between a power semiconductor component and the whole structureis reduced.

The invention discloses an anti-static clothing fabric which is characterized in that the clothing fabric is respectively provided with a first fabric layer, a second fabric layer and a third fabric layer from the inside to the outside, and the first fabric layer is a warm-keeping moisture-guiding layer. The second fabric layer is an antistatic layer, the third fabric layer is an antibacterial andwear-resistant layer; the warm-keeping moisture-guiding layer includes antibacterial moisture-guiding fiber and seaweed carbon fiber; the antistatic layer includes cotton fiber and conductive fiber,and is added with some carboxymethyl cellulose, and the antibacterial and wear-resistant layer includes polyamide fiber, elastic fiber and lignin fiber. The antistatic clothing fabric can play a roleof keeping warm on the basis of antistatic effects, is not easy to damage, increases the antibacterial effect, and protects human health based on the promotion of the overall grade of the clothing fabric.

The invention provides magnetic conductive type organosilicone pouring sealant. The magnetic conductive type organosilicone pouring sealant is prepared from a component A and a component B, wherein the mass ratio of the component A to the component B is 1:1. The component A is composed of, by weight, 100 parts of vinyl silicone oil, 15-20 parts of nanometer zinc ferrite, 8-10 parts of reinforcing agent, 3-5 parts of fire retardant, 1-1.5 parts of coupling agent, 0.5-1 part of inhibitor, 3-4 parts of bulking agent, 7-8 parts of PPS, 2-5 parts of cross-linking agent and 1-3 parts of colorant. The component B is composed of, by weight, 100 parts of vinyl silicone oil and 1-2 parts of catalyst. The invention further provides a preparation method of the organosilicone pouring sealant. The organosilicone pouring sealant has good magnetoconductivity and can effectively shield electromagnetic radiation.

The invention belongs to the technical field of floor and relates to a water soluble electromagnetic wave shielding transfer printing ink and an electromagnetic radiation resistant floor prepared by using the same. The water soluble electromagnetic wave shielding transfer printing ink comprises the following raw materials in part by mass: 25 to 35 parts of acrylic emulsion, 15 to 19 parts of nanobarium ferrite magnetic powder, 20 to 35 parts of deionized water, 1 to 5 parts of alcohol ester-12, 10 to 15 parts of ethylene vinyl acetate (EVA) emulsion, 3 to 6 parts of polyethylene (PE) aqueouswax, 1 to 3 parts of aqueous leveling agent, and 0.1 to 1 part of aqueous defoamer. The electromagnetic radiation preventing effect of the ink is desirable and lasts for a long time. The electromagnetic radiation resistant floor consists of a wear-resistance layer, an electromagnetic radiation resistant layer, a substrate layer and a balance layer in turn from top down. The electromagnetic radiation resistant layer is printed by using the water soluble electromagnetic wave shielding transfer printing ink, can shield electromagnetic radiation and is safe, environmentally-friendly and long in service life.

The invention relates to a radiation-resistant PVC (polyvinyl chloride) film, belonging to the technical field of new materials. The PVC film comprises the following components in percentage by mass: 77% of PVC, 15% of stabilizer, 3% of polypropylene, 3% of ultraviolet absorbent, 1% of acetyl citrate and 1% of silver oxide. The PVC film has the advantage of favorable radiation resistance and can shield 90% of electromagnetic radiation.