CN1454046A - ALuminium plate with envelope and electronic equipment parts using the same - Google Patents
ALuminium plate with envelope and electronic equipment parts using the same Download PDFInfo
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- CN1454046A CN1454046A CN03107892A CN03107892A CN1454046A CN 1454046 A CN1454046 A CN 1454046A CN 03107892 A CN03107892 A CN 03107892A CN 03107892 A CN03107892 A CN 03107892A CN 1454046 A CN1454046 A CN 1454046A
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- resin coating
- tunicle
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- aluminium
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- C—CHEMISTRY; METALLURGY
- C23—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; CHEMICAL SURFACE TREATMENT; DIFFUSION TREATMENT OF METALLIC MATERIAL; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL; INHIBITING CORROSION OF METALLIC MATERIAL OR INCRUSTATION IN GENERAL
- C23C—COATING METALLIC MATERIAL; COATING MATERIAL WITH METALLIC MATERIAL; SURFACE TREATMENT OF METALLIC MATERIAL BY DIFFUSION INTO THE SURFACE, BY CHEMICAL CONVERSION OR SUBSTITUTION; COATING BY VACUUM EVAPORATION, BY SPUTTERING, BY ION IMPLANTATION OR BY CHEMICAL VAPOUR DEPOSITION, IN GENERAL
- C23C28/00—Coating for obtaining at least two superposed coatings either by methods not provided for in a single one of groups C23C2/00 - C23C26/00 or by combinations of methods provided for in subclasses C23C and C25C or C25D
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- B—PERFORMING OPERATIONS; TRANSPORTING
- B32—LAYERED PRODUCTS
- B32B—LAYERED PRODUCTS, i.e. PRODUCTS BUILT-UP OF STRATA OF FLAT OR NON-FLAT, e.g. CELLULAR OR HONEYCOMB, FORM
- B32B15/00—Layered products comprising a layer of metal
- B32B15/04—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material
- B32B15/08—Layered products comprising a layer of metal comprising metal as the main or only constituent of a layer, which is next to another layer of the same or of a different material of synthetic resin
Abstract
An aluminum sheet 1 has a corrosion resistant film 3 and a resin film 4 sequentially formed from an aluminum base sheet 2 side on at least one side of the base sheet 2 having an arithmetical mean roughness Ra of 0.2-0.6 mu m, wherein the corrosion resistant film 3 contains Cr or Zr and has a coating weight of 10-50 mg/m<2> in Cr or Zr terms; the resin film 4 has an average film thickness of 0.05-0.3 mu m, and contains a lubricant of 1-25 mass% with respect to a total resin-coating amount; and the surface of the aluminum base sheet 2 or the corrosion resistant film 3 formed thereon, has such fine projections exposed outside the surface of the resin coating 4 that a surface resistance value between a spherical terminal with a radius of 10 mm and the aluminum base sheet 2 is 1 Omega or less, when the surface on the resin coating 4 side is pressed with the spherical terminal at a load of 0.4 N.
Description
Technical field
The present invention relates to have the aluminium sheet of tunicle.Aluminium sheet with tunicle of the present invention, its conductivity, thermal diffusivity, formability, anti-finger printing and marresistance are good especially, are suitable for doing cover, the fixing raw material of using with the framework or the structure member of electronic equipments such as framework at the back side of the box of various external record devices and underframe, liquid crystal board (panel).In addition, the invention still further relates to the electronic equipment part that uses aluminium sheet making with described tunicle.
Background technology
For the material that electronic equipment is used, often require it to have conductivity.For example, for preventing the faulty operation of disk drive, the conductivity that requires its shell to be necessary is to be used to pacify ground wire (ground connection).Also have, to being used for covering overleaf the fixedly fixing instrument of using of liquid crystal control board of liquid crystal control board, also requirement is used to remove the conductivity as the static of portrait noise root.
In addition, the heat that produces in electronic equipment makes the wiring of this electronic equipment internal break sometimes, perhaps causes the performance degradation of the various electronic units that had in this electronic equipment sometimes.Therefore, to the material that above-mentioned electronic equipment is used, require to have the heat that electronic equipment is produced and be put into outside thermal diffusivity efficiently.
In addition, for the material that above-mentioned electronic equipment is used, require to have to be processed into the formability of desired shape with comparalive ease, or have when carrying or installation electronic equipment, also good appearance be can keep, the anti-finger printing of processing ease and marresistance etc. made.So, for satisfying desired these characteristics of material that above-mentioned electronic equipment is used, in the past, the material that metal materials such as stainless steel (SUS), steel or aluminium are used as above-mentioned electronic equipment.
And,,, use low weight aluminum that the tendency of increase is arranged as the metal material that is used for above-mentioned electronic material recently with headed by the notebook computer.
, when using aluminium to make above-mentioned electronic equipment use material, if use separately is difficult to satisfy above-mentioned various characteristics.So,, various surface treatment methods have been proposed for improving above-mentioned characteristic.
For example, in the Te Kaiping 4-330683 communique, proposed on aluminium sheet, to be coated with the resin that contains lubricant, made the trickle scar that adheres to lip-deep fingerprint or produce unshowy, thereby obtained the motion of the good surface treatment aluminum sheet of anti-finger printing and marresistance on the surface.
By this method, though the anti-finger printing of aluminium sheet and marresistance have raising to a certain degree, but, surface with the aluminium sheet of the resin coating that is equivalent to insulant is insulating properties, so, during from the framework of above-mentioned electronic equipment or structure member earth connection, useful for guaranteeing ground wire, just must be provided with the above-mentioned resin coating part of pruning, expose the subsequent handling that aluminum metal is graded as conductive part.
So, in order to solve the problem of the conductivity of guaranteeing surface of aluminum plate as described, open flat 7-313930 communique and the spy opens flat 7-314601 communique etc. the spy, proposed to be coated with the technology of the resin that contains conductive material.
, resemble the method that resin that above-mentioned handle contains conductive material is coated in surface of aluminum plate, particle that will the electrical material of differentiate is evenly dispersed in the above-mentioned resin.So in the resin coating that surface of aluminum plate forms, when the particle of conductive material contacts with each other inadequate the time, generation can not obtain having the problem of desirable conductivity.Therefore, for obtaining desirable conductivity, be necessary to increase the addition of above-mentioned conductive material.
, if above-mentioned conductive material is added in the above-mentioned resin in large quantities, above-mentioned resin coating hardening is become fragile.So, the aluminium sheet that forms above-mentioned resin coating is being pressurizeed man-hour, crackle (peeling off) problem of above-mentioned resin coating takes place easily.
Summary of the invention
Therefore, the present invention puts in view of the above problems and proposes, it is a kind of that its purpose is to provide, box and underframe have been improved at drive unit, the framework of the electronic equipment of the fixing cover of using the shelf and the back side of liquid crystal control board etc., and desired conductivity and thermal diffusivity in their structure member, simultaneously, even when carrying out press molding, the crackle (peeling off) that also can suppress resin coating, thereby have excellent moldability, and, can reduce the bad outward appearance that the scratch owing to adhesion fingerprint or generation causes significantly, thus the good aluminium sheet of anti-finger printing and marresistance and use its electronic equipment part with tunicle.
The present invention is constructed as follows for achieving the above object.
That is, a kind of aluminium sheet with tunicle is to be the aluminium plate of 0.2～0.6 μ m by center line average roughness Ra, and on the one side at least of above-mentioned aluminium plate, corrosion resistant coating that forms successively from a side of this aluminium plate and resin coating and constitute; Above-mentioned corrosion resistant coating contains Cr or Zr, and the adhesion amount on above-mentioned aluminium plate is 10～50mg/m in Cr or Zr
2Above-mentioned resin coating, average film thickness are 0.05～0.3 μ m, contain the lubricant with respect to 1～25 quality % of all resins tunicle amount; Above-mentioned aluminium plate or the trickle projection that forms the surface of above-mentioned corrosion resistant coating thereon expose on the surface of above-mentioned resin coating; Forming on the face of above-mentioned resin coating one side, compressing the bulbous end period of the day from 11 p.m. to 1 a.m that head portion is radius 10mm with the load of 0.4N, the sheet resistance value between above-mentioned spherical terminal and the above-mentioned aluminium plate is below 1 Ω.
Here, so-called center line average roughness Ra is based on the surface roughness index of JIS B0601.That is, from the height of the average line (center line) of certain interval outline line beginning as Z (x) (x is the coordinate of average line direction), when this interval x coordinate was 0～L, Ra was expressed as:
By above-mentioned formation, because of the center line average roughness Ra of above-mentioned aluminium plate and each average film thickness of corrosion resistant coating and resin coating limit respectively within the limits prescribed, so the trickle projection on the basal surface of above-mentioned aluminium plate or the above-mentioned corrosion resistant coating just can be exposed on the surface of above-mentioned resin coating.Consequently, when having guaranteed desirable conductivity and thermal diffusivity, made the aluminium sheet that formability, anti-finger printing and marresistance have improved with tunicle.
Also have, above-mentioned resin coating is preferably by being that resin, epoxy are that select resin and the vinyl resin at least a constitutes from polyester based resin, carbamate.
By such formation, in that being formed, the above-mentioned aluminium sheet with tunicle adds man-hour, and above-mentioned resin coating is out of shape with the distortion of aluminium plate easily, so, can make the same good aluminium sheet of formability with tunicle with aluminium sheet.
Also have, above-mentioned lubricant is preferably by being that wax, microwax, fluorine are that select wax, lanolin wax, Brazil wax, paraffin and the graphite at least a constitutes from Tissuemat E, polyalkylene.
By such formation, can make above-mentioned surface of aluminum plate have the lubrification of appropriateness, so can make the aluminium sheet that formability further improves with tunicle with tunicle.
In addition, above-mentioned resin coating preferably contains the cataloid with respect to all resins tunicle amount 1～30 quality %.
By such formation, because added the cataloid that higher hardness is arranged in above-mentioned resin coating, marresistance can improve so that above-mentioned resin coating is harder in institute.Its result can make the aluminium sheet with tunicle that above-mentioned marresistance has improved.
And the present invention constitutes with the electronic equipment part that is obtained by above-mentioned aluminium plate forming with tunicle.
By such formation, can obtain the good electronic equipment part of conductivity, thermal diffusivity, formability, anti-finger printing and marresistance.
Description of drawings
Fig. 1 is the mode sectional drawing of expression 1 example structure of the present invention.
Fig. 2 is the ideograph of 1 method of the sheet resistance value of the aluminium sheet of expression mensuration of the present invention with tunicle.
Embodiment
Below embodiments of the present invention are described in detail.Fig. 1 is the mode sectional drawing of the structure of the expression aluminium sheet with tunicle of the present invention.As shown in Figure 1, of the present invention have tunicle aluminium sheet 1 and make like this: on the surface of surface roughness (center line average roughness Ra) being adjusted to the aluminium plate 2 in the limited field of the present invention, lining is used for fully guaranteeing corrosion proof corrosion resistant coating 3, this above corrosion resistant coating 3 formation contain the resin coating 4 of lubricant.Below, illustrate that restriction constitutes the various reasons of wanting cellulose content that tunicle aluminium sheet 1 is arranged of the present invention.(aluminium plate)
There is no particular limitation for aluminium plate 2 of the present invention, can be made of aluminium that has various compositions, quality and thickness of slab as required or aluminium alloy.(the center line average roughness Ra:0.2 of aluminium plate～0.6 μ m)
The average film thickness that comprises the center line average roughness Ra of aluminium plate in the present invention and above-mentioned corrosion resistant coating and resin coating is the important parameter that influence is used in the various characteristicses such as conductivity, formability, anti-finger printing, marresistance and thermal diffusivity of the aluminium sheet in the electronic equipment together.
Promptly, if the center line average roughness Ra less than 0.2 μ m of above-mentioned aluminium plate, the surface gloss of the aluminium sheet that then makes with it, have tunicle is excessive, makes to adhere to the trickle scar that lip-deep fingerprint and surface go up to produce and become showy easily, and anti-finger printing and marresistance descend.Also have, in this case, the basal surface that above-mentioned trickle concavo-convex aluminium plate is arranged, perhaps thereon along the projection of the corrosion resistant coating of above-mentioned trickle concavo-convex formation, become and be difficult to be exposed on the surface of above-mentioned resin coating, so, guarantee that desirable conductivity and thermal diffusivity are difficult.
On the other hand, if the center line average roughness Ra of above-mentioned aluminium plate surpasses 0.6 μ m, then when this aluminium plate was carried out bending machining, this aluminium plate was easy to generate crackle, so at the resin coating of the part of carrying out above-mentioned bending machining, crackle obviously or easily makes above-mentioned resin coating peel off.Therefore, the center line average roughness Ra of the present invention by the above-mentioned aluminium plate of restriction is in 0.2～0.6 mu m range, and what make raisings such as conductivity, formability, anti-finger printing, marresistance and thermal diffusivity thus has a tunicle aluminium sheet.
In addition, as the center line average roughness Ra of aluminium plate, adjust to the interior method of scope of the invention described above regulation, can enumerate: in aluminium plate roll forming operation, set suitable stack with surface roughness and carry out smart method of pricking, or the surface of the aluminium plate after roll forming, under suitable condition, carry out the method for etch processes.
Among the present invention,, form on the trickle concavo-convex aluminium plate, form corrosion resistant coating and resin coating successively at such adjustment center line average roughness Ra.Here, since the thickness limit setting of these corrosion resistant coatings and resin coating in the scope of the present invention regulation, so, the trickle projection of the basal surface of above-mentioned aluminium plate or corrosion resistant coating, can be exposed on the surface of resin coating, like this, when having guaranteed desirable conductivity and thermal diffusivity, what can obtain that formability, anti-finger printing and marresistance improve has a tunicle aluminium sheet.(corrosion resistant coating)
The corrosion resistant coating that comprises in the present invention designs with desired corrosion resistance in order to give the aluminium plate.In the present invention, as above-mentioned corrosion resistant coating, be known in the past Cr or Zr corrosion resistant coating as main component.Also can suitably use chromium phosphate hydrochlorate tunicle, chromic acid chromium hydrochlorate tunicle, basic zirconium phosphate tunicle, application type chromate tunicle or application type zirconium tunicle etc.
In addition, in the present invention, for example use well-known x-ray fluorescence method, can be fairly simple and record the adhesion amount (calculating) of above-mentioned Cr or Zr quantitatively with Cr or Zr, so, can under the situation that does not influence productivity ratio, carry out quality management to above-mentioned aluminium sheet with tunicle.(the adhesion amount of corrosion resistant coating: 10～50mg/m
2)
If the adhesion amount that comprises corrosion resistant coating in the present invention in Cr or Zr, compares 10mg/m
2Few, all surfaces of the aluminium plate that then can not be covered equably is difficult to guarantee corrosion resistance.Therefore, when being used for electronic equipment,, cannot stand long-term use as aluminium sheet with tunicle.The main component Cr of this corrosion resistant coating or Zr are metallic elements in addition, so, if these metallic elements are exposed at the surface that comprises above-mentioned resin coating in the present invention, just further improved conductivity and the thermal diffusivity that the tunicle aluminium sheet is arranged of the present invention.
On the other hand, if surpass 50mg/m
2Though, guaranteed conductivity and thermal diffusivity, when press molding, the generation crackle of corrosion resistant coating (peeling off) own, the long-time difficulty of process are kept the problem of high corrosion-resistant.So in the present invention, the adhesion amount above-mentioned corrosion resistant coating is limited in 10～50mg/m in Cr or Zr
2Scope in.(resin coating)
Comprising resin coating in the present invention, is for providing desirable anti-finger printing and marresistance to design to the aluminium sheet with tunicle that is used for electronic equipment.And in the present invention, in order to present desirable anti-finger printing and marresistance, the average film thickness restriction of above-mentioned resin coating within the limits prescribed.(the average film thickness of resin coating: 0.05～0.3 μ m)
That is, if the average film thickness deficiency of above-mentioned resin coating 0.05 μ m, then anti-finger printing, marresistance descend, and also have, and lubrification is also insufficient, the difficulty so the processing that is shaped becomes.And, if the average film thickness of above-mentioned resin coating surpasses 0.3 μ m, even under the very thick situation of the surface roughness of aluminium plate, resin coating almost completely covers the basal surface of aluminium plate or corrosion resistant coating, therefore, it is very high that sheet resistance value becomes, and conductivity can not be guaranteed.Also have, in this case, the heat storage of generation can not suitably be guaranteed thermal diffusivity in resin coating.So in the present invention, the average film thickness of restriction resin coating is in the scope of 0.05～0.3 μ m.
In addition, from the viewpoint of formability, above-mentioned resin coating is preferably than the resin that is easier to be out of shape along with the distortion of aluminium plate.Wherein better is by being that resin, epoxy are that select resin and the vinyl resin at least a constitutes from polyester based resin, carbamate.
Also have, the present invention does not have special regulation to the formation method of above-mentioned resin coating.For example, from the viewpoint of boosting productivity, preferably using can be on the aluminium plate of the coiled type that forms corrosion resistant coating, continuously the roll coating process of coating liquid shape resin.In this case, by the liquid resin of coating roller (rollcoater) coating, during by continuous oven interior, toasted and become resin coating.
At this moment, above-mentioned resin coating is a liquid form being coated on beginning on the corrosion resistant coating, so preferential filling reflects the recess on the corrosion resistant coating surface of aluminium plate surface roughness in a way, by the baking processing of next carrying out, form the relatively tunicle of hard.
And, in the present invention, obtained in advance the relation of each parameter of the adhesion amount (in Cr or Zr) of the average film thickness of the various performances of anti-finger printing and marresistance, above-mentioned resin coating, the surface roughness of above-mentioned aluminium plate (center line average roughness Ra) and corrosion resistant coating respectively, based on their relation, for obtaining desirable anti-finger printing and marresistance, rationally set the value of above-mentioned each parameter.
Also have, among the present invention, the average film thickness of above-mentioned resin coating can be with comparalive ease obtained from the area and the used amount of resin of the part that forms this resin coating.(with respect to the content of the lubricant of all resins tunicle amount: 1～25 quality %)
Comprising in the present invention lubricant and be the formability that has an aluminium sheet of tunicle for raising designs.If the amount of above-mentioned lubricant then can not obtain sufficient lubrification with respect to the quantity not sufficient 1 quality % of all resins tunicle.Lubrification is insufficient, becomes the reason that adds a part of local deformation, resin coating centre attenuation and crackle (peeling off) that formed products takes place man-hour.
Also have, the amount of above-mentioned lubricant surpasses 25 quality % with respect to the amount one of all resins tunicle, and the effect that lubrification improves is met.But then, above-mentioned resin coating make the film reduction, become the reason that marresistance reduces, perhaps, add man-hour, the spall of the resin coating that a part is peeled off (dregs) is deposited in the inside of the metal mold that pressurization processes.Consequently there is the shaping processing of tunicle aluminium sheet to bring bad influence to this.So, in the present invention, be restricted to 1～25 quality % with respect to the content of the lubricant of all resins tunicle amount.
In addition, as above-mentioned lubricant, from the raising of suitable coordination formability and the relation of economy, preferably by being that wax, microwax, fluorine are that select wax, lanolin wax, Brazil wax, paraffin and the graphite at least a constitutes from Tissuemat E, polyalkylene.
Also having, in the present invention, is wax as above-mentioned polyalkylene, and can be suitable for the oxidation polyalkylene is wax, is that can be suitable for polytetrafluoroethylene be wax to wax as above-mentioned fluorine.(projection on aluminium plate basal surface or the corrosion resistant coating exposes to the resin coating surface)
Aluminium sheet with tunicle of the present invention during as electronic equipment part, should suitably be guaranteed the conductivity of this aluminium sheet and ground wire contact.Therefore, basal surface or the projection on the corrosion resistant coating that above-mentioned trickle concavo-convex aluminium plate is arranged that comprises in the present invention is necessary to be exposed on the surface of above-mentioned resin coating.And, trickle projection on the basal surface of above-mentioned aluminium plate or the corrosion resistant coating is exposed at the degree (decentralization) on above-mentioned resin coating surface, and the relation of the center line average roughness Ra that basically can be by suitably adjusting above-mentioned aluminium plate and the average film thickness of above-mentioned resin coating is adjusted.(sheet resistance value: 1 Ω is following)
Also have, of the present invention have a tunicle aluminium sheet, is necessary to make and utilizes the method for narrating later to measure sheet resistance value below 1 Ω.That is, above-mentioned sheet resistance value surpass 1 Ω have the tunicle aluminium sheet to be used for electronic equipment the time, remove fully and result from electromagnetic noise and become very difficult.Particularly, when above-mentioned electronic equipment is drive unit, bring out writing or the mistake of regenerating easily.Also have, when above-mentioned electronic equipment is liquid crystal indicator, image noise takes place easily.So the present invention stipulates that above-mentioned sheet resistance value is below 1 Ω.
Among the present invention, in order to make sheet resistance value is below 1 Ω, in the scope of the above-mentioned aluminium plate center line average roughness Ra that the present invention stipulates (0.2～0.6 μ m), and in the average film thickness scope of above-mentioned resin coating (0.05～0.3 μ m), can suitably adjust above-mentioned aluminium plate center line average roughness Ra, and the average film thickness of above-mentioned resin coating.And then, aluminium sheet with tunicle of the present invention, be by being the above-mentioned resin coating that the aluminium plate of Ra forms suitable homogeneous to above-mentioned center line average roughness, make along the projection of the above-mentioned corrosion resistant coating of the trickle concavo-convex formation of this aluminium plate, expose desirable degree (decentralization) on above-mentioned resin coating surface.The state that exposes like this just can obtain the following sheet resistance value of 1 above-mentioned Ω at the desirable position on this surface.
In addition, as to the far-reaching parameter of above-mentioned sheet resistance value, except the center line average roughness Ra of above-mentioned aluminium plate, and outside the average film thickness of above-mentioned resin coating, can also enumerate the kind of kind, lubricant of resin and amount etc.Therefore, only with the dependency relation between the average film thickness of the center line average roughness Ra of above-mentioned aluminium plate and above-mentioned resin coating, qualification the present invention is difficult.So the present invention limits with comprising " sheet resistance value is the following aluminium sheet with tunicle of 1 Ω " such restrictive condition as above-mentioned.
The above-mentioned sheet resistance value that the tunicle aluminium sheet is arranged of the present invention of such qualification can be measured by following method.Fig. 2 is the ideograph of an example of the assay method of the above-mentioned sheet resistance value of expression.The assay method of this sheet resistance value, it is a terminal in-circuit testing device 11, be connected on the back side that tunicle aluminium sheet 10 is arranged that forms corrosion resistant coating and resin coating on the surface of aluminium plate or end face, remove the part of corrosion resistant coating and resin coating with polishings such as sand paper, another terminal of in-circuit testing device 11, the metallic of spherical terminal that has the almost spherical shape of radius 10mm by top ends is measured rod 12, be connected on the mensuration place of the resin coating of tunicle aluminium sheet 10, measure.
In addition, described metallic is measured rod 12, can be with manufacturings such as high conductive brass
And, be pressed in the mensuration place of the resin coating of tunicle aluminium sheet 10 being arranged at spherical terminal that metallic measures excellent 12 head portions with the load of 0.4N (40gf), measure the sheet resistance value that tunicle aluminium sheet 10 is respectively arranged in this state.In addition, metallic is measured the natural oxide film on excellent 12 surfaces, makes the measured value generation deviation of above-mentioned sheet resistance, so, be preferably in before the sheet resistance pH-value determination pH, measure the surface of rod 12 in advance with polishing metallic such as sand paper, remove this layer natural oxide film as far as possible.
Also have, among the present invention, when measuring to above-mentioned sheet resistance value, when using analog in-circuit testing device 11, should get rid of the influence of these in-circuit testing device 11 internal resistances, so, before carrying out the sheet resistance pH-value determination pH, preferably, carry out zero correction measuring the mensuration part that the spherical terminal of excellent 12 head portions constitutes and contact with opposite electrode by being arranged at metallic.And, in the present invention, in the mensuration of above-mentioned sheet resistance value, use the most responsive wave band of analog in-circuit testing device 11, when the pointer of described in-circuit testing device 11 stops, the value of this pointer indication as measured value.
In addition, the same with above-mentioned analog in-circuit testing device 11 before carrying out above-mentioned sheet resistance pH-value determination pH when using digital in-circuit testing device in the present invention, carry out zero correction, measure with the most responsive wave band of this in-circuit testing device.And numeral represented when this digital in-circuit testing device is stablized is as measured value.
In addition, in the present invention, for fully guaranteeing the reliability of above-mentioned sheet resistance measured value, so, preferably to tunicle aluminium sheet 10 is respectively arranged, at least at 10 random sites, carry out the mensuration of described sheet resistance value, its mean value is adopted as the above-mentioned sheet resistance value of the present invention restriction.
Having on the aluminium plate of limited field roughness of the present invention, when being formed with the corrosion resistant coating of limited field adhesion amount of the present invention and the resin coating of limited field thickness of the present invention being arranged, basal surface or above-mentioned corrosion resistant coating as the above-mentioned aluminium plate of conductor, moderately be exposed on the surface of above-mentioned resin coating, thereby can reduce above-mentioned sheet resistance value.At this moment, if above-mentioned sheet resistance value is below 1 Ω, when on being above-mentioned aluminium plate, forming on the aluminium sheet of corrosion resistant coating and resin coating earth connection successively, can make guarantee on the contact of this ground wire and aluminium sheet, to have conductivity the tunicle aluminium sheet arranged.
; the surface roughness of above-mentioned aluminium plate; to be its center line average roughness Ra littler than the scope of the present invention's restriction, when the average film thickness of above-mentioned resin coating is thicker than the scope of the present invention's restriction; promptly; resemble above-mentioned resin coating and almost completely be covered under the such structure condition of aluminium plate, it is very high that above-mentioned sheet resistance value becomes, so; when the present invention is applied to electronic equipment, removes the electromagnetic wave noise that externally takes place fully and become difficult.Therefore, for example, if drive unit can bring out writing and the mistake of regenerating, perhaps, in liquid crystal display, portrait noise etc. takes place.
And then, basal surface with aluminium plate of above-mentioned micro concavo-convex, perhaps the projection of above-mentioned corrosion resistant coating suitably is exposed on the surface of above-mentioned resin coating, what constitute like this of the present inventionly has a tunicle aluminium sheet, when being applied to electronic equipment, the heat that this electronic equipment produces can be by above-mentioned exposed portions serve, be put in the atmosphere effectively, so can improve the heat dissipation characteristics of this electronic equipment.(content of colloidal silicon dioxide of resin coating :) with respect to 1～30 quality % of all resins tunicle amount
In the present invention, by the further hardization of resin coating that comprises in the present invention, can improve marresistance.Therefore, when having cataloid than higher hardness to add in the above-mentioned resin coating, the effect that helps improving above-mentioned marresistance will be played.In this resin coating, above-mentioned cataloid addition can not obtain resembling above-mentioned marresistance effect during with respect to all resins tunicle quantity not sufficient 1 quality % fully.In addition, when above-mentioned cataloid addition surpassed 30 quality % with respect to all resins tunicle amount, the hardness of above-mentioned resin coating was too high, so being shaped adds man-hour, above-mentioned resin coating is easy to generate crackle (peeling off).Therefore, the above-mentioned cataloid of Tian Jiaing in the present invention is preferably with respect to 1～30 quality % of all resins tunicle amount.(embodiment)
Below the comparative example with embodiments of the invention, discontented unabridged version invention necessary condition specifies the present invention.At first, be included in aluminium plate in the foregoing description and the comparative example as following making.That is, at first,, make the aluminium alloy ingot bar through the casting and the treatment process that homogenizes after the dissolving of the aluminium alloy of regulation.Then through overheated bundle, cold bundle and each operation of heat treatment, make aluminium plate (thickness of slab: 0.5mm, alloy species: AA5052-H34) then.In addition,, suitably change the surface roughness of roll forming roller, can obtain the aluminium plate of various surface roughnesses (center line average roughness) by final (processing at last) operation at above-mentioned cold bundle.
Then, above-mentioned aluminium plate is carried out alkali degreasing, next, form corrosion resistant coating on the surface of this aluminium plate, and then, on corrosion resistant coating, form resin coating, obtain the aluminium sheet of the foregoing description and comparative example.The main composition that the tunicle aluminium sheet is arranged of these embodiment and comparative example such as table 1 are not.
In addition, in an embodiment, use Tissuemat E as lubricant.
Also have, the mean roughness of the aluminium plate of the foregoing description and comparative example, it is each aluminium plate to them, (little slope research institute makes with roughness tester, corrugated sheet SE-30D), with the rectangular scanning direction of roll forming direction, measure by centering line average roughness Ra (JISB0601).(table 1)
| | Numbering | 1. the surface roughness Ra of aluminium plate (μ m) | Corrosion resistant coating | Resin coating | Remarks | ||||
| 2.Cr amount (mg/m 2) | 3. kind annotates 1) | 4. average film thickness (μ m) | 5. amounts of lubrication (quality %) | 6. cataloid amount (quality %) | |||||
| | 1 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????0 | 6. be 0 | |
| 2 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????0 | The same | ||
| 3 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????0 | The same | ||
| 4 | ????0.5 | ????20 | ????A | ????0.1 | ????2 | ????0 | The same | ||
| 5 | ????0.5 | ????20 | ????A | ????0.1 | ????20 | ????0 | The same | ||
| 6 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????1 | Contain 6. | ||
| 7 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????5 | The same | ||
| 8 | ????0.5 | ????20 | ????B | ????0.1 | ????5 | ????0 | 6. be 0 | ||
| 9 | ????0.5 | ????20 | ????C | ????0.1 | ????5 | ????0 | The same | ||
| 10 | ????0.5 | ????20 | ????D | ????0.1 | ????5 | ????0 | The same | ||
| Comparative example | 1 | ????0.05 | ????20 | ????A | ????0.1 | ????5 | ????0 | 1. outside regulation | |
| 2 | ????2.0 | ????20 | ????A | ????0.1 | ????5 | ????0 | The same | ||
| 3 | ????0.5 | ????5 | ????A | ????0.1 | ????5 | ????0 | 2. outside regulation | ||
| 4 | ????0.5 | ????100 | ????A | ????0.1 | ????5 | ????0 | The same | ||
| 5 | ????0.5 | ????20 | ????A | ????0.005 | ????5 | ????0 | 4. outside regulation | ||
| 6 | ????0.5 | ????20 | ????A | ????0.01 | ????5 | ????0 | The same | ||
| 7 | ????0.5 | ????20 | ????A | ????1 | ????5 | ????0 | The same | ||
| 8 | ????0.5 | ????20 | ????A | ????0.1 | ????0 | ????0 | 5. outside regulation | ||
| 9 | ????0.5 | ????20 | ????A | ????0.1 | ????50 | ????0 | The same | ||
| 10 | ????0.5 | ????20 | ????A | ????0.1 | ????5 | ????50 | 6. outside regulation | ||
Notes 1) kind of resin coating
A: polyester based resin
B: carbamate is a resin
C: epoxy is a resin
D: vinyl resin
Also have, the foregoing description that object is made like this and comparative example the tunicle aluminium sheet respectively arranged, estimate by following method.Their evaluation result is as shown in table 2.(evaluation method) [conductivity]
Conductivity is used analog loopback verifier (SANWA ELECTRONINSTRUMENT society system, model C P-70) with above-mentioned assay method, measures the sheet resistance value of each aluminium sheet.[thermal diffusivity]
The thermal diffusivity of the foregoing description and comparative example is by following mensuration.At first, in order to use, cut into the box-shape of 3.5 inches typical HDD having the box (cover) of the aluminium sheet of tunicle as HDD.Then, use them, the one side that forms above-mentioned resin coating as the outside, is covered on above-mentioned HDD, make HDD in running order and produce heat, measure above-mentioned surface of aluminum plate variation of temperature with electronic thermometer.And the variations in temperature during use aluminium plate bare board is judged the thermal diffusivity of each plate as benchmark.The temperature that is up to almost with identical being evaluated as of bare board " zero (well) " of above-mentioned aluminium plate, than higher being evaluated as of bare board " * (bad) " of above-mentioned aluminium plate.[formability]
The formability of the foregoing description and comparative example, at first, as crackle (peeling off) the property evaluation of the resin coating after the bending machining, crackle (peeling off) state of the resin coating of each processing part when their each aluminium sheet being carried out bending machining by visualization, and estimate.Further, as bending machining test,, estimate by carrying out 180 ° of bend tests based on the bend test of the 6.4th regulation of JIS H4001.But, inner radius identical with thickness of slab (1T bending).
And, the determinating reference of above-mentioned resin coating crackle (peeling off) state, be not seeing be evaluated as " zero (well) " that crackle (peeling off) is arranged on the resin coating, though the part of resin coating has been produced extremely slight crackle, but be evaluated as " △ (roughly good) " that in quality management, does not have special problem, resin coating there be evaluated as " * (bad) " of obvious crackle (peeling off), and the formability of each embodiment and comparative example is estimated.
Also have,, measured the coefficient of friction that the tunicle aluminium sheet is respectively arranged of the foregoing description and comparative example in order to estimate lubrification to the influential surface of aluminum plate of formability.
Here, if the coefficient of friction of above-mentioned aluminium sheet below 0.2, then can be evaluated as in the shaping processing that various electronic equipments carry out usually, there is not special problem.This Determination of Friction Coefficient is by Bauden (バ ウ テ Application) method, selects 3 places to measure at random on the surface of each aluminium sheet, and has adopted their mean value.[anti-finger printing]
Each of the foregoing description and comparative example there is the surface of tunicle aluminium sheet, touches in bare hand, measure and be stained with the front and back aberration (△ E) of fingerprint, thereby the anti-finger printing of each plate is estimated.The colored colour difference meter (CR-300) that above-mentioned aberration (△ E) uses minaoluta company to make is measured.
In addition,, then adhere to the fingerprint on the above-mentioned surface of aluminum plate, with the naked eye almost can not see if aberration △ E value is below 0.5.[marresistance]
As the marresistance index of the resin coating of the foregoing description and comparative example, use pencil hardness.That is, pencil hardness is to measure by the pencil test of 8.4 regulations of JIS K5400.This pencil test carries out according to the test method of JIS K5400 8.4.1 item regulation, and enforcement load is 9.8N (1kgf).
(table 2)
| Classification | Numbering | Assessment item | Remarks | |||||
| Conductivity | Thermal diffusivity | Formability | Anti-finger printing | Marresistance | ||||
| Sheet resistance value (Ω) | Surface temperature changes | Tunicle crackle (peeling off) after the bending machining | Coefficient of friction | ??△E | Pencil hardness | |||
| Embodiment | 1 | ????0.2 | ????○ | ????○ | ??0.06 | ????0.16 | ????5H | The influence of aluminium plate surface roughness Ra |
| Comparative example | 1 | ????2 | ????× | ????○ | ??0.06 | ????0.60 | ????3H | |
| Comparative example | 2 | ????0.1 | ????○ | ????× | ??0.26 | ????0.05 | ????4H | |
| Embodiment | 2 | ????0.2 | ????○ | ????○ | ??0.06 | ????0.16 | ????5H | The influence of the adhesion amount of corrosion resistant coating |
| Comparative example | 3 | ????0.2 | ????○ | ????△ | ??0.06 | ????0.21 | ????4H | |
| Comparative example | 4 | ????0.2 | ????○ | ????△ | ??0.06 | ????0.23 | ????3H | |
| Embodiment | 3 | ????0.2 | ????○ | ????○ | ??0.06 | ????0.16 | ????5H | The influence of the average film thickness of resin coating |
| Comparative example | 5 | ????0.0 | ????○ | ????× | ??0.92 | ????0.88 | ????2H | |
| Comparative example | 6 | ????0.0 | ????○ | ????△ | ??0.48 | ????0.35 | ????3H | |
| Comparative example | 7 | ????5 | ????× | ????○ | ??0.05 | ????0.19 | ????5H | |
| Embodiment | 4 | ????0.2 | ????○ | ????○ | ??0.10 | ????0.18 | ????5H | The influence of amounts of lubrication |
| Embodiment | 5 | ????0.2 | ????○ | ????○ | ??0.05 | ????0.18 | ????5H | |
| Comparative example | 8 | ????0.2 | ????○ | ????× | ??0.77 | ????0.35 | ????4H | |
| Comparative example | 9 | ????0.2 | ????○ | ????○ | ??0.05 | ????0.14 | ????3H | |
| Embodiment | 6 | ????0.2 | ????○ | ????○ | ??0.06 | ????0.18 | ????5H | The influence of cataloid addition |
| Embodiment | 7 | ????0.2 | ????○ | ????○ | ??0.08 | ????0.17 | ????6H | |
| Comparative example | 10 | ????0.2 | ????○ | ????△ | ??0.08 | ????0.23 | ????6H | |
| Embodiment | 8 | ????0.2 | ????○ | ????○ | ??0.07 | ????0.13 | ????5H | The influence of resin kind |
| Embodiment | 9 | ????0.2 | ????○ | ????○ | ??0.07 | ????0.22 | ????5H | |
| Embodiment | 10 | ????0.2 | ????○ | ????○ | ??0.07 | ????0.28 | ????4H | |
From above-mentioned each evaluation result shown in the table 2, can know following thing.(influence of aluminium plate surface roughness (center line average roughness Ra))
Center line average roughness Ra is less than the comparative example 1 of prescribed limit lower limit of the present invention, and anti-finger printing, marresistance, conductivity and thermal diffusivity worsen.And above-mentioned center line average roughness Ra surpasses the comparative example 2 of prescribed limit higher limit of the present invention, and coefficient of friction is 0.26, becomes very high, is shaped to add man-hour, can see the obvious crackle (peeling off) of resin coating.(influence of the adhesion amount of corrosion resistant coating)
The adhesion amount of Cr in corrosion resistant coating, less than the comparative example 3 of prescribed limit lower limit of the present invention, can not the be covered all surfaces of aluminium plate of corrosion resistant coating, corrosion resistance is abominable.Also have, the being adjacent to property deterioration of the resin coating of comparative example 3, so, on the resin coating after the bend test, can see extremely slight crackle.And the adhesion amount of the Cr in corrosion resistant coating above the comparative example 4 of prescribed limit higher limit of the present invention, on the resin coating after the bend test, can be seen extremely slight crackle.(influence of the average film thickness of resin coating)
The average film thickness of resin coating, comparative example 5 and comparative example 6 less than prescribed limit lower limit of the present invention, can not be covered the fully all surfaces of aluminium plate of resin coating, so, coefficient of friction becomes big (being respectively 0.96,0.48), on the resin coating after the bend test, can see crackle, add, marresistance also worsens.And, in comparative example 5, to add that also anti-finger printing also worsens.And the average film thickness of resin coating surpasses the comparative example 7 of higher limit, has the trickle concavo-convex aluminium plate basal surface or the projection of corrosion resistant coating not to be exposed on the surface of resin coating, so sheet resistance value uprises, and thermal diffusivity also worsens.(influence of amounts of lubrication)
The amount of lubricant is less than the comparative example 8 of prescribed limit lower limit of the present invention, and coefficient of friction becomes big (0.77), after the bend test, can see tangible crackle (peeling off) on the resin coating, that is, formability worsens.And the amount of lubricant surpasses the comparative example 9 of higher limit, and marresistance worsens.(influence of cataloid addition)
The cataloid addition surpasses the comparative example 10 of prescribed limit higher limit of the present invention, and bendability degenerates, so, can on resin coating, see extremely slight crackle.
On the other hand, confirmed adhesion amount, the resin coating of surface roughness (center line average roughness Ra), the corrosion resistant coating of aluminium plate kind, thickness, be contained in the amount of the lubricant in the resin coating, whichever is the embodiment in prescribed limit of the present invention 1～10 all, and conductivity, thermal diffusivity, formability, anti-finger printing and marresistance are no problem fully.
In addition, the present invention is not only limited to these embodiment, and based on technological thought of the present invention, it also is possible suitably changing.For example, in these embodiments,, used the resin coating that contains the lubricant that constitutes by polyethylene-based wax as resin coating.; if the present invention uses; contain beyond the above-mentioned lubricant, by being that wax, microwax, fluorine are the resin coating of at least a lubricant that constitutes selected wax, lanolin wax, Brazil wax, paraffin and the graphite from polyalkylene, also can obtain the effect same with these embodiment.
And then authors of the present invention have clarified, and when above-mentioned embodiments of the invention 1～10 are applied in electronic equipment, can access above-mentioned characteristic, i.e. the thing of the electronic equipment part that conductivity, thermal diffusivity, formability, anti-finger printing and marresistance are good.
As above-mentioned, according to the present invention, the box and the underframe of well-known drive unit before making can be provided, framework and structure member that the liquid crystal control board is fixed with the various electronic equipments such as cover at the framework and the back side have suitable desired conductivity and thermal diffusivity, simultaneously, reduce significantly owing to be bonded at of the bad influence of the trickle scar of lip-deep fingerprint and surface generation outward appearance, and then, surface lubrication is good, even carry out press molding, the resin coating that forms on the surface do not take place yet crackle (peeling off) the tunicle aluminium sheet is arranged and with its part material of electronic equipment.
Also have, the present invention, in the operation of making electronic equipment because use above-mentioned have excellent moldability the tunicle aluminium sheet arranged, so the bad incidence of the quality when having reduced press molding can improve the rate of finished products of goods.Thus, the present invention can reduce the whole cost of above-mentioned electronic equipment part, and its result goes far towards to reduce the expense of electronic equipment goods.
Claims (5)
1. aluminium sheet with tunicle is to be the aluminium plate of 0.2～0.6 μ m and in the one side at least of above-mentioned aluminium plate by center line average roughness Ra, and the corrosion resistant coating and the resin coating that begin to form successively from described aluminium plate side constitute; Above-mentioned corrosion resistant coating contains Cr or Zr, and counts 10～50mg/m in the adhesion amount of above-mentioned aluminium plate with Cr or Zr
2The average film thickness of above-mentioned resin coating is 0.05～0.3 μ m, and contains the lubricant with respect to all resins tunicle amount 1～25 quality %; Above-mentioned aluminium plate or form the trickle projection on the surface of above-mentioned corrosion resistant coating thereon exposes on the surface of above-mentioned resin coating; On the face that forms above-mentioned resin coating one side, with the load of 0.4N, pushing head portion is the bulbous end period of the day from 11 p.m. to 1 a.m of radius 10mm, and the sheet resistance value between above-mentioned spherical terminal and the above-mentioned aluminium plate is below 1 Ω.
2. the aluminium sheet with tunicle according to claim 1, wherein above-mentioned resin coating are by being that resin, epoxy are that select resin and the vinyl resin at least a constitutes from polyester based resin, carbamate.
3. the aluminium sheet with tunicle according to claim 1, wherein above-mentioned lubricant are by being that wax, microwax, fluorine are that select wax, lanolin wax, Brazil wax, paraffin and the graphite at least a constitutes from Tissuemat E, polyalkylene.
4. the aluminium sheet with tunicle according to claim 1, wherein above-mentioned resin coating contains the cataloid with respect to all resins tunicle amount 1～30 quality %.
5. an electronic equipment part is to use any described aluminium plate forming with tunicle of claim 1～4.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| JP2002122495A JP4237975B2 (en) | 2002-04-24 | 2002-04-24 | Aluminum plate for electronic equipment and molded product for electronic equipment using the same |
| JP2002122495 | 2002-04-24 |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN1454046A true CN1454046A (en) | 2003-11-05 |
| CN1209952C CN1209952C (en) | 2005-07-06 |
Family
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CNB031078923A Expired - Fee Related CN1209952C (en) | 2002-04-24 | 2003-04-01 | ALuminium plate with envelope and electronic equipment parts using the same |
Country Status (4)
| Country | Link |
|---|---|
| JP (1) | JP4237975B2 (en) |
| KR (1) | KR100473517B1 (en) |
| CN (1) | CN1209952C (en) |
| TW (1) | TW200305504A (en) |
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| CN102162097A (en) * | 2010-02-23 | 2011-08-24 | 株式会社神户制钢所 | Precoating aluminum plate for electronic device |
| CN103240931A (en) * | 2012-02-03 | 2013-08-14 | 株式会社神户制钢所 | Aluminium plate for forming |
| CN104884673A (en) * | 2013-01-25 | 2015-09-02 | 株式会社Uacj | Lubricative aluminum coating material |
| CN105247737A (en) * | 2013-05-29 | 2016-01-13 | 日本轻金属株式会社 | Conducting member |
| CN106013676A (en) * | 2015-03-30 | 2016-10-12 | 日吉华株式会社 | Building material |
| CN107557785A (en) * | 2017-09-13 | 2018-01-09 | 广东宝冠板材科技有限公司 | Resistance and fingerprint resistance household electrical appliances sheet material and preparation method thereof |
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2002
- 2002-04-24 JP JP2002122495A patent/JP4237975B2/en not_active Expired - Fee Related
-
2003
- 2003-04-01 CN CNB031078923A patent/CN1209952C/en not_active Expired - Fee Related
- 2003-04-09 TW TW092108146A patent/TW200305504A/en not_active IP Right Cessation
- 2003-04-23 KR KR10-2003-0025799A patent/KR100473517B1/en not_active IP Right Cessation
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| CN102162097A (en) * | 2010-02-23 | 2011-08-24 | 株式会社神户制钢所 | Precoating aluminum plate for electronic device |
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Also Published As
| Publication number | Publication date |
|---|---|
| TW200305504A (en) | 2003-11-01 |
| JP2003313684A (en) | 2003-11-06 |
| TWI304767B (en) | 2009-01-01 |
| JP4237975B2 (en) | 2009-03-11 |
| KR100473517B1 (en) | 2005-03-09 |
| CN1209952C (en) | 2005-07-06 |
| KR20030084710A (en) | 2003-11-01 |
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