CN201321520Y - Shielding fabric for magnetic field - Google Patents

Abstract

The utility model discloses a shielding fabric for a magnetic field, which is formed by interweaving permalloy wires and dressing yarns. The permalloy wires are woven in at least one of the warp directions or the latitudinal directions of the fabric. The shielding fabric for the magnetic field can be used for magnetic field shield and particularly aims at the magnetic field shield of DC-300 Hz stationary magnetic fields and extremely low frequency magnetic fields.

Description

A kind of magnetic field loomage

Technical field

The utility model relates to fabric, relates in particular to the fabric with magnetic field shielding function.

Background technology

Magnetic field shielding generally is meant the shielding to direct current and low frequency magnetic field (100kHz is following).Two kinds of methods of general employing: a kind of is that magnetic field sources is shielded, and magnetic field shielding in the space of regulation, is not outwards propagated.Another kind is that disturbed source is shielded, and the decay environmental magnetic field is to the influence in disturbed source.With respect to electromagnetic field of high frequency (0.1MHz-300GHz), magnetic field shielding has certain degree of difficulty.On the engineering, magnetic field shielding is designed to closure casings such as box, shell after being mostly to adopt high-permeability materials such as steel, iron to make metallic plate, sheet metal or metal forming.Metallic plate, sheet metal is thick and hard, and metal forming fragility is big, can only be made into the shield of given shape by modes such as welding or riveted joints, all can not arbitrarily carry out cutting to make as taking material, is applied to individual protection.

Some place is to utilize the magnetic field sources operation, can not carry out engineering shielding to magnetic field sources, and influence in various degree can be caused to nervous system, cardiovascular system, the immunologic function of human body in magnetic field.Therefore, be badly in need of a kind of magnetic field loomage, can be sewn into apparel applications in individual protection, the decay environmental magnetic field is to the effect of human body; Also can make radome in addition, be applied to shield the magnetic field sources of different shape.

U.S. Pat P5578359 proposes: can use non-crystaline amorphous metal METGLAS band and be woven into flaky material, make the pullover clothes of cotta armor shape, patients wears when doing the biological inspection of magnetoelectricity, and shield effectiveness is poor, only is 4/3dB.

States such as U.S., moral developed a kind of wire in recent years in succession, and introduction can be made magnetic field shielding clothes purposes.But do not see relevant report for forming fabric or clothes.

CN1234910C has introduced a kind of multi-functional aluminum-base flexible shielding material technology of preparing, adopt electrochemical method plating one deck magnetically soft alloy film on aluminium base, realize the purpose of reflection, electromagnetic shielding, be applicable to fields such as the reflection of high-frequency electromagnetic shielding, electric field shielding and low frequency magnetic screen and visible light, infra-red radiation reflection, whether have shield effectiveness for stationary magnetic field and extremely low frequency electromagnetic fields and do not mention.

China has document to introduce a kind of ferromagnetism wire rod fabric, and gauge or diameter of wire is thick, and the thinnest is 0.7mm, and fabric is hard, the easy-to-rust fracture, and wearability is poor.

Above-mentioned shielding material all has various defective, is difficult to satisfy simultaneously and has certain wearability, can effectively shield stationary magnetic field and extremely low frequency electromagnetic fields (DC～300Hz), can be applied to the requirement of individual protection.

The utility model content

The purpose of this utility model is the defective that exists in the prior art in order to overcome, and a kind of magnetic field loomage is provided.

Magnetic field loomage of the present utility model, for the permalloy silk with take yarns interwoven and form, wherein, the warp-wise of fabric or at least one the direction layout in the broadwise have the permalloy silk.For example, can adopt and take yarn and make warp thread, permalloy silk or permalloy silk with take yarn and alternately arrange in proportion and make weft yarn; Also can the permalloy silk or the permalloy silk alternately arrange in proportion and make warp thread with taking yarn, take yarn and make weft yarn; Also can both direction all layout the permalloy silk is arranged.

The permalloy silk is for being the alloy silk of material with the permalloy, and permalloy silk of the present utility model be the permalloy silk through softening annealing process and magnetic annealing PROCESS FOR TREATMENT, and diameter of alloy wire is 0.035mm-0.20mm, preferably 0.10mm-0.15mm.

Preferable, the material of described permalloy silk is selected from permalloy 1J79 or permalloy 1J85.Wherein J represents " Precise Alloy ", " 1 " expression soft magnetism, and the numeral of back is a sequence number, the nickel content in the ordinary representation alloy.

Permalloy is meant iron-nickel alloy, and the wide range of its nickel content is between 35%-90%.Its maximum characteristics are to have very high low-intensity magnetic field permeability.Their saturation induction density is generally between 0.6--1.0T.Outside two kinds of essential elements of deironing nickel, permalloy also can add some other element, for example molybdenum, copper etc.The purpose of adding these elements is the resistivity that increases material, to reduce to make the eddy current loss behind the iron core.Simultaneously, add the hardness that element also can improve material, this is particularly advantageous in the application that wearing and tearing are arranged as magnetic head etc.

The described yarn of taking can also can be synthetic threads such as polyester filament, chinlon filament for textile, polyester-cotton blend yarn, and fineness can be adjusted according to the fineness of permalloy silk, and preferred 21 ^s/ 2～40 ^s/ 2.

The warp count of magnetic field loomage is 220～380/10cm; Weft count is 200～480/10cm.

In the warp-wise or broadwise of magnetic field loomage, the radical ratio of permalloy silk and textile yarn is 1～10: 1.Perhaps, one of the warp-wise of magnetic field loomage or broadwise all are the permalloy silk.

The magnetic field loomage institutional framework can adopt structures such as twill or satin weave.

Permalloy silk in the magnetic field loomage of the present utility model prepares through following step:

Permalloy is drawn into the filament that diameter is 0.035mm-0.20mm, makes through softening annealing process and magnetic annealing technology.

The permalloy silk can adopt the special-thread wire drawing machine to realize through the multiple tracks drawing.

Above-mentioned softening annealing process is: 1050 ℃～1080 ℃ of annealing temperatures, the speed that the permalloy silk passes through is 2～8 meters/minute.

Above-mentioned magnetic annealing technology is: the control temperature kept 2-6 hour for 1050 ℃～1150 ℃ in annealing furnace earlier, then be cooled to 500 ℃～700 ℃ by 150 ℃ of-200 ℃/speed at one hour rating, after this come out of the stove after being chilled to 200 ℃ soon with 400-500 ℃/speed at one hour rating, air cooling is to room temperature, in the hope of obtaining required magnetic conductivity and less coercivity.

Magnetic field loomage of the present utility model can be used for magnetic field shielding.Preferable, above-mentioned magnetic field shielding is meant the magnetic field shielding to the stationary magnetic field of DC～300Hz and very low frequencies magnetic field.

But experiment showed, stationary magnetic field and the very low frequencies magnetic field of magnetic field loomage effective attenuation DC～300Hz that permalloy silk of the present utility model makes, but the softness cutting can be applicable to individual protection (as preparation magnetic field shielding clothes) and magnetic field sources shielding etc.

Description of drawings

Fig. 1: magnetic field loomage schematic diagram of the present utility model

The specific embodiment

The utility model will be specifically described by following examples, adopt method of testing as follows in an embodiment:

The fabric test method: fabric is fixed in the shielding cavity of a side opening, inserts the source, stationary magnetic field or the Extremely Low Frequency Electromagnetic field source of certain intensity, the magnetic field intensity (H of shielding cavity before and after the record fabric is put into ₀, H ₁) or induced voltage (V ₀, V ₁), through type (1) and formula (2) calculating magnetic field shield effectiveness (SE) or magnetic field shielding efficient (η).

The clothes method of testing: clothes are put into the uniform magnetic field source of certain frequency, test the magnetic field intensity H that clothes are put into preceding uniform magnetic field source respectively ₀Or induced voltage V ₀With the magnetic field intensity H that puts into the back inner ₁Or induced voltage V ₁, through type (1) and formula (2) calculating magnetic field armoured magnetic field shield effectiveness (SE) or magnetic field shielding efficient (η).

$\mathrm{SE}=201g\frac{H_0}{H_1}$ Or $\mathrm{SE}=201g\frac{V_0}{V_1}...\left(1\right)$

$\mathrm{\η}=\frac{H_0-H_1}{H_0}\×100\%$ Or $\mathrm{\η}=\frac{V_0-V_1}{V_0}\×100\%...\left(2\right)$

Embodiment 1

Magnetic field loomage as shown in Figure 1, for the permalloy silk with take yarns interwoven and form, wherein, the broadwise of fabric be through soft annealing and magnetic annealing, silk is the permalloy silk of 0.15mm directly, warp-wise is 32 ^s/ 2 combed cotton yarns.

The preparation of permalloy silk:

Permalloy 1J85 is drawn into filament, silk footpath 0.15mm;

Soft annealing: 1050 ℃～1080 ℃ of annealing temperatures, the speed that the permalloy silk passes through is 2～8 meters/minute;

Magnetic annealing: the control temperature kept 5 hours for 1050 ℃～1150 ℃ in annealing furnace earlier, then was cooled to 500 ℃～700 ℃ by 150 ℃/speed at one hour rating, after this was chilled to 200 ℃ soon with 400 ℃/speed at one hour rating and came out of the stove, and air cooling (cooling off in the air) is to room temperature.

The permalloy silk softness that makes also has certain magnetic.

Adopt above-mentioned permalloy silk to make weft yarn, adopt 32 ^s/ 2 combed cotton yarns are made warp thread, looming weaving after the warping.

Fabric structure is used 5 piece 2 and is flown through the face satin weave.

Warp count is 272/10cm, and weft count is 400/10cm.

Test result: see Table 1.

Table 1

Embodiment 2

Magnetic field loomage as shown in Figure 1, for the permalloy silk with take yarns interwoven and form, wherein, the broadwise of fabric be through soft annealing and magnetic annealing, silk is the permalloy silk of 0.10mm directly, warp-wise is 21 ^sThe combing polyester.

The preparation of permalloy silk:

Permalloy 1J79 is drawn into filament, silk footpath 0.10mm;

Soft annealing: 1050 ℃～1080 ℃ of annealing temperatures, the speed that the permalloy silk passes through is 2～8 meters/minute;

Magnetic annealing: the control temperature kept 5 hours for 1050 ℃～1150 ℃ in annealing furnace earlier, then was cooled to 500 ℃～700 ℃ by 150 ℃/speed at one hour rating, after this was chilled to 200 ℃ soon with 500 ℃/speed at one hour rating, and the air cooling of coming out of the stove is to room temperature.

The permalloy silk softness that makes also has certain magnetic.

Adopt 21 ^sThe combing polyester is made warp thread; Above-mentioned permalloy silk is made weft yarn, looming weaving after the warping.

Institutional framework is 3/1 twill left to right.

312/10cm of fabric warp count; Weft count is 440/10cm.，

Test result: see Table 2.

Table 2

Embodiment 3

Magnetic field loomage, for the permalloy silk with take yarns interwoven and form, wherein, the broadwise of fabric be through soft annealing and magnetic annealing, silk is the permalloy silk of 0.035mm directly, warp-wise is permalloy silk and 80 ^s/ 2 combed cotton yarns were arranged by 2: 1 and are made warp thread.

The preparation of permalloy silk:

Permalloy 1J79 is drawn into filament, silk footpath 0.035mm;

Soft annealing: 1050 ℃～1080 ℃ of annealing temperatures, the speed that the permalloy silk passes through is 2～8 meters/minute;

Magnetic annealing: the control temperature kept 2 hours for 1050 ℃～1150 ℃ in annealing furnace earlier, then was cooled to 500 ℃～700 ℃ by 200 ℃/speed at one hour rating, after this was chilled to 200 ℃ soon with 450 ℃/speed at one hour rating and came out of the stove, and air cooling is to room temperature.

The permalloy silk softness that makes also has certain magnetic.

Adopt above-mentioned permalloy silk to make weft yarn, above-mentioned permalloy silk and 80 ^s/ 2 combed cotton yarns were arranged by 2: 1 and are made warp thread, looming weaving after the warping.Fabric structure is used 3/1 twill left to right.

Warp count is 360/10cm, and weft count is 272/10cm.

Fabric sofetening, dimensionally stable can carry out cutting and make.

Claims (7)

1. a magnetic field loomage is characterized in that, for the permalloy silk with take yarns interwoven and form, wherein, the warp-wise of fabric or at least one the direction layout in the broadwise have the permalloy silk.

2. magnetic field loomage according to claim 1 is characterized in that described permalloy silk is the permalloy silk through softening annealing process and magnetic annealing PROCESS FOR TREATMENT, and diameter of alloy wire is 0.035mm-0.20mm.

3. as magnetic field loomage as described in the claim 2, it is characterized in that the diameter of described permalloy silk is 0.10mm-0.15mm.

4. magnetic field loomage according to claim 1 is characterized in that the described yarn of taking is that fineness is 21 ^s/ 2～40 ^s/ 2 purified cotton yarns, polyester-cotton blend yarn, polyester filament or chinlon filament.

5. magnetic field loomage according to claim 1 is characterized in that the warp count of described magnetic field loomage is 220～380/10cm; Weft count is 200～480/10cm.

6. magnetic field loomage according to claim 1, it is characterized in that in the warp-wise or broadwise of magnetic field loomage, permalloy silk and textile yarn are in 1～10: 1 ratio is alternately arranged, perhaps, one of the warp-wise of magnetic field loomage or broadwise all are the permalloy silk.

7. magnetic field loomage according to claim 1 is characterized in that described magnetic field loomage institutional framework is twill structure or satin weave structure.

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