CN201307453Y - Indoor flame-retardant coaxial radio frequency television cable - Google Patents
Indoor flame-retardant coaxial radio frequency television cable Download PDFInfo
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- CN201307453Y CN201307453Y CNU2008202161099U CN200820216109U CN201307453Y CN 201307453 Y CN201307453 Y CN 201307453Y CN U2008202161099 U CNU2008202161099 U CN U2008202161099U CN 200820216109 U CN200820216109 U CN 200820216109U CN 201307453 Y CN201307453 Y CN 201307453Y
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Abstract
The utility model relates to an indoor flame-retardant coaxial radio frequency television cable which can reduce the cost under the premise of ensuring the insulatibity, the flame retardance, the mechanical property and the transmission property of the cable. The indoor flame-retardant coaxial radio frequency television cable comprises twisted insulated wire conductors, a shielding layer, a flame-retardant layer and a sheath which are arranged from inside to outside in sequence, wherein the flame-retardant layer is made of flame-retardant polyolefine, the sheath is made of nylon, and the flame-retardant layer and the sheath cover the shielding layer through the double-layer coextrusion technology. The thickness of the flame-retardant layer is 0.35-0.40mm. The thickness of the sheath is 0.10-0.13mm. The flame-retardant layer and the sheath are separated and formed by adopting the double-layer coextrusion technology, and the indoor flame-retardant data cable has the advantages that the environment can be protected, the flame retardance is good, the heat can be resisted, the mechanical strength and the anti-electromagnetism capacity are good, the cost is low, the weight is light, the service life is prolonged by more than one time, the material can be conveniently recycled and repeatedly used after the wires are discarded, therefore, the energy resources can be saved.
Description
Technical field
The utility model relates to a kind of indoor fire-retardant coaxial radio-frequency camera cable.
Background technology
For a long time, the coaxial radio-frequency camera cable of indoor tv transmission uses polyvinyl chloride to be sheath, life-span≤15 year.Polyvinyl chloride contains lead, and mercury, cadmium, Cr VI etc. is the poisonous metal compound of not labile long-term pollution environment under field conditions (factors), and halogens chlorine can discharge the fatal pernicious gas of bioxin when burning.Enter 21 century, in the face of environmental protection and economizing on resources, the harm pay attention to day by day that in the world wide use pvc sheath cable is brought environment and life.Use from the restriction polyvinyl chloride cable turns to complete prohibition.
Use the low-smoke halogen-free flame-retardant sheath material, as adding the polyolefin or the cross-linking radiation polyolefin of metallic compound aluminium hydroxide and/or magnesium hydroxide.The advantage of this method is: a. does not contain any material to environment and human body harmful; B. fire-retardant, when burning, can not discharge pernicious gas and smog; C. polyolefin aging-resistant advantage is doubled the useful life of electric wire to reach 30 years.Add metallic compound as fire retardant but have following shortcoming: a., the material structure compactness descends, and has influenced the mechanical strength and the electric insulating quality of cable; B. because imporosity and electric insulating quality descend, in order to guarantee insulation and flame retardant effect, fire proofing must reach certain thickness; C. add metallic compound fire proofing proportion is increased, and the per kilogram unit price is higher than polyvinyl chloride, make that material cost is more than two times of polyvinyl chloride.
The indoor fire-retardant coaxial radio-frequency camera cable of a kind of known Halogen comprises insulated electric conductor conductor, screen, flame retardant sheath layer from inside to outside successively.Flame retardant sheath layer adopts screw extruder that flame retardant sheath layer is coated to cable outer layer, uses the flame retardant sheath layer of bittern-free flame-proof material must reach certain thickness (0.7-0.75mm), could bear the insulation of cable simultaneously and guarantee mechanical strength.This halogen-free flame-retardant cable still exists flame-retardant layer thickness bigger, the defective of material price costliness.
The utility model content
The utility model provides a kind of indoor fire-retardant coaxial radio-frequency camera cable, under the prerequisite that guarantees cable insulation, anti-flammability, mechanical performance, transmission performance, reduces cost.
Described indoor fire-retardant coaxial radio-frequency camera cable comprises insulated electric conductor conductor, screen, flame-retardant layer, sheath from inside to outside successively, and wherein the flame-retardant layer material is a fire retardant polyolefin, and flame-retardant layer and sheath adopt double-layer coextrusion technology to coat screen.Described fire retardant polyolefin can be current material for containing the polyolefin of metallic compound, has commercially available.Described metallic compound can be the mixture of aluminium hydroxide, magnesium hydroxide or both arbitrary proportions.
The utility model separates flame-retardant layer and sheath, uses double-layer coextrusion technology.Under the prerequisite that guarantees certain insulating properties and anti-flammability, expensive flame-retardant layer thickness reduces, and material cost reduces greatly.Adopt the utility model, when flame-retardant layer thickness is 0.35-0.40mm, when jacket thickness was 0.10-0.13mm, described flame retardant cable had excellent insulating properties, anti-flammability and mechanical performance.
Flame-retardant layer is covered with sheath outward, and thickness is about 0.1-0.13mm according to the long-pending size of cross-sectional area of conductor.Sheath material can be selected known various material for use, to satisfy different requirements.As nylon (this area commonly used be nylon 6 and nylon 12) is the environment-friendly materials polymer, uses to have flexibility, ageing resistance on cable jacket, the transparency, light specific gravity (1.13), melting point height, corrosion resistant advantage adds one deck nylon at cable and makees sheath, increases the mechanical strength of cable, thereby make flame-retardant layer need not to consider mechanical strength, reduce flame-retardant layer thickness, make the cable insulation external diameter reduce weight saving, economize on resources, reduce material cost.When selecting the flame-retardant layer material simultaneously, its electric and mechanical performance needn't be taken into account simultaneously,, thereby the material of low price about 20% can be used based on fire-retardant requirement.
Realize technological process of the present utility model as shown in Figure 2.Process conditions technology routinely determine that specific requirement is as follows:
(1) copper conductor insulating barrier plastic extruding machine should be selected screw rod according to the thermoplasticity of different materials, sets heating-up temperature, and is outer with the core rounding.
(2) two layers of aluminium foil, two layers of woven shield coat.
(3) flame-retardant layer and sheath co-extrusion require the same core of thin-walled.
The utility model separates flame-retardant layer and restrictive coating, utilizes double-layer coextrusion technology, has the following advantages:
(1) environmental protection: not halogen-containing, do not produce harmful halogen gas and corrosive gas during burning; Be not fuming during burning or the amount of being fuming few; Do not contain heavy metals such as aluminium and aluminium compound, do not contain environmental hormone, not contaminated soil.
(2) good flame resistance.
(3) insulation, fire-retardant and sheath material can reclaim and reuse after electric wire is discarded easily.
(4) has excellent mechanical intensity.
(5) cost is lower.
(6) weight is lighter.
(7) improve (〉=30 years) more than 1 times useful life, economize on resources.
The utility model meets following standard fully on machinery, electric property and environmental protection index:
(1)GB135-1998
(2) Japanese EM series No. the 422nd, JCS of cable standard (1998);
(3) European EN-71 part:3, the Amendment:2000 standard.
Description of drawings
Fig. 1 is the utility model schematic cross-section;
Fig. 2 is the utility model process chart.
Embodiment
Wire conductor is a copper conductor, through alignment and preheating, enter extruder die, the plastic extruding machine temperature is 195 ℃, the polythene material of plasticizing is provided, and wherein polyethylene is that Sinopec Yangzi Petrochemical Co produces, and model is 5310M, closely be coated on the wire conductor, form the insulating barrier of thickness 1.9mm.With two layers of aluminium foil and two layers of magnalium silk woven shield 2.Use two plastic extruding machine co-extrusions, the plastic extruding machine temperature is respectively 195 ℃ and 230 ℃, form the flame-retardant layer 3 of thickness 0.3-0.35mm and the sheath 4 of thickness 0.1-0.13mm, flame-retardant layer 3 materials are that (the Yadong special cable material factory that borders on the sea produces flame-proof polyethylene, model is HW461-1), the material of sheath 4 is a nylon 6, obtains flame retardant cable as shown in Figure 1, comprises insulated electric conductor conductor 1, screen 2, flame-retardant layer 3 and sheath 4 from inside to outside successively.The leading indicator of this flame retardant cable is when transmission frequency is 800MHZ after tested: attenuation constant 19.0dB/100m, shielding attenuation 〉=90dB, return loss 〉=22dB, burning test meets the GB/T2951.4-1997 requirement, meets following standard on machinery, electric property and environmental protection index fully:
(1)GB135-1998
(2) Japanese EM series No. the 422nd, JCS of cable standard (1998);
(3) European EN-71 part:3, the Amendment:2000 standard.
Claims (5)
1. an indoor fire-retardant coaxial radio-frequency camera cable is characterized in that comprising successively from inside to outside insulated electric conductor conductor, screen, flame-retardant layer, sheath, and wherein the flame-retardant layer material is a fire retardant polyolefin, and flame-retardant layer and sheath adopt double-layer coextrusion technology to coat screen.
2. indoor fire-retardant coaxial radio-frequency camera cable as claimed in claim 1 is characterized in that described flame-retardant layer thickness is 0.35-0.40mm.
3. indoor fire-retardant coaxial radio-frequency camera cable as claimed in claim 1 is characterized in that described restrictive coating thickness is 0.10-0.13mm.
4. as each described indoor fire-retardant coaxial radio-frequency camera cable among the claim 1-3, it is characterized in that described flame-retardant layer material is a flame-proof polyethylene.
5. as each described indoor fire-retardant coaxial radio-frequency camera cable among the claim 1-3, it is characterized in that sheath material is a nylon.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202161099U CN201307453Y (en) | 2008-11-20 | 2008-11-20 | Indoor flame-retardant coaxial radio frequency television cable |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2008202161099U CN201307453Y (en) | 2008-11-20 | 2008-11-20 | Indoor flame-retardant coaxial radio frequency television cable |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN201307453Y true CN201307453Y (en) | 2009-09-09 |
Family
ID=41099920
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNU2008202161099U Expired - Fee Related CN201307453Y (en) | 2008-11-20 | 2008-11-20 | Indoor flame-retardant coaxial radio frequency television cable |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN201307453Y (en) |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956307A (en) * | 2011-08-26 | 2013-03-06 | 江苏兴海线缆有限公司 | Elastic body polrvinyl chloride nylon sheathed cable |
| US10991483B2 (en) * | 2015-11-20 | 2021-04-27 | Essex Furukawa Magnet Wire Japan Co., Ltd. | Assembled wire, method of producing the same, and electrical equipment using the same |
-
2008
- 2008-11-20 CN CNU2008202161099U patent/CN201307453Y/en not_active Expired - Fee Related
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102956307A (en) * | 2011-08-26 | 2013-03-06 | 江苏兴海线缆有限公司 | Elastic body polrvinyl chloride nylon sheathed cable |
| US10991483B2 (en) * | 2015-11-20 | 2021-04-27 | Essex Furukawa Magnet Wire Japan Co., Ltd. | Assembled wire, method of producing the same, and electrical equipment using the same |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20090909 Termination date: 20101120 |