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Electromagnetic wave shielding
by：CSSSLD
2021-02-03
Filler composite shielding plastics conductive performance is generally selected excellent large size fibrous or flaky materials, such as metal fiber, metal, metal plating, in addition, still can use carbon fiber, superconductive carbon black, metal alloy, such as filling, all can achieve satisfactory shielding effect.
With iron fibers and injection molding processing material of nylon 6, PP, PC composite shielding plastics, when the filling amount to 20%
27%, shielding effect can reach 60
80分贝。
the filled conductive plastics is the mechanical blending method, there are a lot of shortcomings. A new preparation method is to use polymerization filling method, in this way can make the fillers in polymer matrix evenly distributed, and conductive performance is greatly improved, and it has good physical and mechanical properties. Conductive plastic because of easy processing and forming, density is small, the resistivity can be adjusted in a wide range of advantages and is widely used, mainly focused on the electronics industry, communications equipment, and energy industry.
according to actual needs, to the current use of shielding materials of all kinds of electronic equipment, in the 30 - 100 MHZ frequency range, its shielding effect at least more than 35 db is still as the effective shielding. Currently used in electromagnetic shielding plastics variety, according to different preparation methods, the type can be divided into the surface of conductive shielding plastics and filler composite shielding plastics two kinds big. Filling composite shielding plastics with conductive performance is stable, can be a lot of time processing complicated shape of shielding the advantages of plastic products, is currently the most promising new shielding materials.
all kinds of electronic equipment and instruments at work produces different frequencies and reflection of electromagnetic waves. In the absence of effective shielding protection measures, the electromagnetic wave will interfere with the normal work of the electronic device, the electronic device itself also will be affected by external electromagnetic interference. With a variety of commercial and household electronic products of the rapid increase in the number, the electromagnetic interference has become a new social public hazards.
with good electrical conductivity of metal as the shell of the electronic equipment, do not cross interference of electromagnetic wave problems, however, use common plastic instead of metal materials as a shell, there will be a serious electromagnetic interference. This is because the common plastic electrical insulation, mostly for electromagnetic wave can hardly absorption and reflection, there is no shielding ability. Common plastic, therefore, must go through the proper process, make its relatively high electrical conductivity, can make its good electromagnetic shielding.
the dosage of carbon black filled conductive plastic injection tooling is very big, is mainly used for anti-static materials, defect is colour and lustre is restricted, fiber filled conductive plastic electrical conductivity and mechanical properties are good, but the cost is higher, metal packing good electrical conductivity, cost lower than that of carbon fiber, have certain advantages. 10 um level of metal fibre by 5% - diameter 15% weight percentage filling into ABS, can get good electrical conductivity.
because of the shielding effectiveness is electromagnetic shielding material reflection, absorption and the sum of internal reflection and attenuation is associated with the electrical conductivity of the material, also related to permeability, therefore, good performance of electromagnetic shielding materials should have high electrical conductivity and magnetic permeability. In essence belongs to electromagnetic interference noise, therefore, as shielding material, its actual shielding effect is measured by the size of the db value. It is generally believed that 10 - When 30 db into smaller shielding effect. 30 - 60 db for medium shielding effect, 60 - 90 db for the good, and the shielding effect of the best for more than 90 db.
more excellent articles: plastic dielectric strength, click directly.
http://www。 csssld。 cn//html/2017/Info_0122/471。 HTML
nantong on suye's official website: http://www. csssld。 cn//
the filled conductive plastics is the mechanical blending method, there are a lot of shortcomings. A new preparation method is to use polymerization filling method, in this way can make the fillers in polymer matrix evenly distributed, and conductive performance is greatly improved, and it has good physical and mechanical properties. Conductive plastic because of easy processing and forming, density is small, the resistivity can be adjusted in a wide range of advantages and is widely used, mainly focused on the electronics industry, communications equipment, and energy industry.
according to actual needs, to the current use of shielding materials of all kinds of electronic equipment, in the 30 - 100 MHZ frequency range, its shielding effect at least more than 35 db is still as the effective shielding. Currently used in electromagnetic shielding plastics variety, according to different preparation methods, the type can be divided into the surface of conductive shielding plastics and filler composite shielding plastics two kinds big. Filling composite shielding plastics with conductive performance is stable, can be a lot of time processing complicated shape of shielding the advantages of plastic products, is currently the most promising new shielding materials.
all kinds of electronic equipment and instruments at work produces different frequencies and reflection of electromagnetic waves. In the absence of effective shielding protection measures, the electromagnetic wave will interfere with the normal work of the electronic device, the electronic device itself also will be affected by external electromagnetic interference. With a variety of commercial and household electronic products of the rapid increase in the number, the electromagnetic interference has become a new social public hazards.
with good electrical conductivity of metal as the shell of the electronic equipment, do not cross interference of electromagnetic wave problems, however, use common plastic instead of metal materials as a shell, there will be a serious electromagnetic interference. This is because the common plastic electrical insulation, mostly for electromagnetic wave can hardly absorption and reflection, there is no shielding ability. Common plastic, therefore, must go through the proper process, make its relatively high electrical conductivity, can make its good electromagnetic shielding.
the dosage of carbon black filled conductive plastic injection tooling is very big, is mainly used for anti-static materials, defect is colour and lustre is restricted, fiber filled conductive plastic electrical conductivity and mechanical properties are good, but the cost is higher, metal packing good electrical conductivity, cost lower than that of carbon fiber, have certain advantages. 10 um level of metal fibre by 5% - diameter 15% weight percentage filling into ABS, can get good electrical conductivity.
because of the shielding effectiveness is electromagnetic shielding material reflection, absorption and the sum of internal reflection and attenuation is associated with the electrical conductivity of the material, also related to permeability, therefore, good performance of electromagnetic shielding materials should have high electrical conductivity and magnetic permeability. In essence belongs to electromagnetic interference noise, therefore, as shielding material, its actual shielding effect is measured by the size of the db value. It is generally believed that 10 - When 30 db into smaller shielding effect. 30 - 60 db for medium shielding effect, 60 - 90 db for the good, and the shielding effect of the best for more than 90 db.
more excellent articles: plastic dielectric strength, click directly.
http://www。 csssld。 cn//html/2017/Info_0122/471。 HTML
nantong on suye's official website: http://www. csssld。 cn//
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